Area | |
---|---|

Common symbols | A |

SI unit | Square metre [m^{2}] |

In SI base units | 1 m ^{2} |

Dimension |

**Area** is the quantity that expresses the extent of a two-dimensional region, shape, or planar lamina, in the plane. Surface area is its analog on the two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat.^{ [1] } It is the two-dimensional analog of the length of a curve (a one-dimensional concept) or the volume of a solid (a three-dimensional concept).

- Formal definition
- Units
- Conversions
- Other units including historical
- History
- Circle area
- Triangle area
- Quadrilateral area
- General polygon area
- Areas determined using calculus
- Area formulas
- Polygon formulas
- Area of curved shapes
- General formulas
- List of formulas
- Relation of area to perimeter
- Fractals
- Area bisectors
- Optimization
- See also
- References
- External links

The area of a shape can be measured by comparing the shape to squares of a fixed size.^{ [2] } In the International System of Units (SI), the standard unit of area is the square metre (written as m^{2}), which is the area of a square whose sides are one metre long.^{ [3] } A shape with an area of three square metres would have the same area as three such squares. In mathematics, the unit square is defined to have area one, and the area of any other shape or surface is a dimensionless real number.

There are several well-known formulas for the areas of simple shapes such as triangles, rectangles, and circles. Using these formulas, the area of any polygon can be found by dividing the polygon into triangles.^{ [4] } For shapes with curved boundary, calculus is usually required to compute the area. Indeed, the problem of determining the area of plane figures was a major motivation for the historical development of calculus.^{ [5] }

For a solid shape such as a sphere, cone, or cylinder, the area of its boundary surface is called the surface area.^{ [1] }^{ [6] }^{ [7] } Formulas for the surface areas of simple shapes were computed by the ancient Greeks, but computing the surface area of a more complicated shape usually requires multivariable calculus.

Area plays an important role in modern mathematics. In addition to its obvious importance in geometry and calculus, area is related to the definition of determinants in linear algebra, and is a basic property of surfaces in differential geometry.^{ [8] } In analysis, the area of a subset of the plane is defined using Lebesgue measure,^{ [9] } though not every subset is measurable.^{ [10] } In general, area in higher mathematics is seen as a special case of volume for two-dimensional regions.^{ [1] }

Area can be defined through the use of axioms, defining it as a function of a collection of certain plane figures to the set of real numbers. It can be proved that such a function exists.

An approach to defining what is meant by "area" is through axioms. "Area" can be defined as a function from a collection M of a special kinds of plane figures (termed measurable sets) to the set of real numbers, which satisfies the following properties:^{ [11] }

- For all
*S*in*M*,*a*(*S*) ≥ 0. - If
*S*and*T*are in*M*then so are*S*∪*T*and*S*∩*T*, and also*a*(*S*∪*T*) =*a*(*S*) +*a*(*T*) −*a*(*S*∩*T*). - If
*S*and*T*are in*M*with*S*⊆*T*then*T*−*S*is in*M*and*a*(*T*−*S*) =*a*(*T*) −*a*(*S*). - If a set
*S*is in*M*and*S*is congruent to*T*then*T*is also in*M*and*a*(*S*) =*a*(*T*). - Every rectangle
*R*is in*M*. If the rectangle has length*h*and breadth*k*then*a*(*R*) =*hk*. - Let
*Q*be a set enclosed between two step regions*S*and*T*. A step region is formed from a finite union of adjacent rectangles resting on a common base, i.e.*S*⊆*Q*⊆*T*. If there is a unique number*c*such that*a*(*S*) ≤ c ≤*a*(*T*) for all such step regions*S*and*T*, then*a*(*Q*) =*c*.

It can be proved that such an area function actually exists.^{ [12] }

Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measured in square metres (m^{2}), square centimetres (cm^{2}), square millimetres (mm^{2}), square kilometres (km^{2}), square feet (ft^{2}), square yards (yd^{2}), square miles (mi^{2}), and so forth.^{ [13] } Algebraically, these units can be thought of as the squares of the corresponding length units.

The SI unit of area is the square metre, which is considered an SI derived unit.^{ [3] }

Calculation of the area of a square whose length and width are 1 metre would be:

1 metre × 1 metre = 1 m^{2}

and so, a rectangle with different sides (say length of 3 metres and width of 2 metres) would have an area in square units that can be calculated as:

3 metres × 2 metres = 6 m^{2}. This is equivalent to 6 million square millimetres. Other useful conversions are:

- 1 square kilometre = 1,000,000 square metres
- 1 square metre = 10,000 square centimetres = 1,000,000 square millimetres
- 1 square centimetre = 100 square millimetres.

In non-metric units, the conversion between two square units is the square of the conversion between the corresponding length units.

- 1 foot = 12 inches,

the relationship between square feet and square inches is

- 1 square foot = 144 square inches,

where 144 = 12^{2} = 12 × 12. Similarly:

- 1 square yard = 9 square feet
- 1 square mile = 3,097,600 square yards = 27,878,400 square feet

In addition, conversion factors include:

- 1 square inch = 6.4516 square centimetres
- 1 square foot = 0.09290304 square metres
- 1 square yard = 0.83612736 square metres
- 1 square mile = 2.589988110336 square kilometres

There are several other common units for area. The are was the original unit of area in the metric system, with:

- 1 are = 100 square metres

Though the are has fallen out of use, the hectare is still commonly used to measure land:^{ [13] }

- 1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres

Other uncommon metric units of area include the tetrad, the hectad, and the myriad.

The acre is also commonly used to measure land areas, where

- 1 acre = 4,840 square yards = 43,560 square feet.

An acre is approximately 40% of a hectare.

On the atomic scale, area is measured in units of barns, such that:^{ [13] }

- 1 barn = 10
^{−28}square meters.

The barn is commonly used in describing the cross-sectional area of interaction in nuclear physics.^{ [13] }

In India,

- 20 dhurki = 1 dhur
- 20 dhur = 1 khatha
- 20 khata = 1 bigha
- 32 khata = 1 acre

In the 5th century BCE, Hippocrates of Chios was the first to show that the area of a disk (the region enclosed by a circle) is proportional to the square of its diameter, as part of his quadrature of the lune of Hippocrates,^{ [14] } but did not identify the constant of proportionality. Eudoxus of Cnidus, also in the 5th century BCE, also found that the area of a disk is proportional to its radius squared.^{ [15] }

Subsequently, Book I of Euclid's *Elements* dealt with equality of areas between two-dimensional figures. The mathematician Archimedes used the tools of Euclidean geometry to show that the area inside a circle is equal to that of a right triangle whose base has the length of the circle's circumference and whose height equals the circle's radius, in his book * Measurement of a Circle *. (The circumference is 2π*r*, and the area of a triangle is half the base times the height, yielding the area π*r*^{2} for the disk.) Archimedes approximated the value of π (and hence the area of a unit-radius circle) with his doubling method, in which he inscribed a regular triangle in a circle and noted its area, then doubled the number of sides to give a regular hexagon, then repeatedly doubled the number of sides as the polygon's area got closer and closer to that of the circle (and did the same with circumscribed polygons).

Swiss scientist Johann Heinrich Lambert in 1761 proved that π, the ratio of a circle's area to its squared radius, is irrational, meaning it is not equal to the quotient of any two whole numbers.^{ [16] } In 1794 French mathematician Adrien-Marie Legendre proved that π^{2} is irrational; this also proves that π is irrational.^{ [17] } In 1882, German mathematician Ferdinand von Lindemann proved that π is transcendental (not the solution of any polynomial equation with rational coefficients), confirming a conjecture made by both Legendre and Euler.^{ [16] }^{:p. 196}

Heron (or Hero) of Alexandria found what is known as Heron's formula for the area of a triangle in terms of its sides, and a proof can be found in his book, *Metrica*, written around 60 CE. It has been suggested that Archimedes knew the formula over two centuries earlier,^{ [18] } and since *Metrica* is a collection of the mathematical knowledge available in the ancient world, it is possible that the formula predates the reference given in that work.^{ [19] }

In 499 Aryabhata, a great mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, expressed the area of a triangle as one-half the base times the height in the * Aryabhatiya * (section 2.6).

A formula equivalent to Heron's was discovered by the Chinese independently of the Greeks. It was published in 1247 in *Shushu Jiuzhang* ("Mathematical Treatise in Nine Sections"), written by Qin Jiushao.

In the 7th century CE, Brahmagupta developed a formula, now known as Brahmagupta's formula, for the area of a cyclic quadrilateral (a quadrilateral inscribed in a circle) in terms of its sides. In 1842 the German mathematicians Carl Anton Bretschneider and Karl Georg Christian von Staudt independently found a formula, known as Bretschneider's formula, for the area of any quadrilateral.

The development of Cartesian coordinates by René Descartes in the 17th century allowed the development of the surveyor's formula for the area of any polygon with known vertex locations by Gauss in the 19th century.

The development of integral calculus in the late 17th century provided tools that could subsequently be used for computing more complicated areas, such as the area of an ellipse and the surface areas of various curved three-dimensional objects.

For a non-self-intersecting (simple) polygon, the Cartesian coordinates (*i*=0, 1, ..., *n*-1) of whose *n* vertices are known, the area is given by the surveyor's formula:^{ [20] }

where when *i*=*n*-1, then *i*+1 is expressed as modulus *n* and so refers to 0.

The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length l and width w, the formula for the area is:^{ [2] }^{ [21] }

*A*=*lw*(rectangle).

That is, the area of the rectangle is the length multiplied by the width. As a special case, as *l* = *w* in the case of a square, the area of a square with side length s is given by the formula:^{ [1] }^{ [2] }^{ [22] }

*A*=*s*^{2}(square).

The formula for the area of a rectangle follows directly from the basic properties of area, and is sometimes taken as a definition or axiom. On the other hand, if geometry is developed before arithmetic, this formula can be used to define multiplication of real numbers.

Most other simple formulas for area follow from the method of dissection. This involves cutting a shape into pieces, whose areas must sum to the area of the original shape.

For an example, any parallelogram can be subdivided into a trapezoid and a right triangle, as shown in figure to the left. If the triangle is moved to the other side of the trapezoid, then the resulting figure is a rectangle. It follows that the area of the parallelogram is the same as the area of the rectangle:^{ [2] }

*A*=*bh*(parallelogram).

However, the same parallelogram can also be cut along a diagonal into two congruent triangles, as shown in the figure to the right. It follows that the area of each triangle is half the area of the parallelogram:^{ [2] }

- (triangle).

Similar arguments can be used to find area formulas for the trapezoid ^{ [23] } as well as more complicated polygons.^{ [24] }

The formula for the area of a circle (more properly called the area enclosed by a circle or the area of a disk) is based on a similar method. Given a circle of radius *r*, it is possible to partition the circle into sectors, as shown in the figure to the right. Each sector is approximately triangular in shape, and the sectors can be rearranged to form an approximate parallelogram. The height of this parallelogram is *r*, and the width is half the circumference of the circle, or π*r*. Thus, the total area of the circle is π*r*^{2}:^{ [2] }

*A*= π*r*^{2}(circle).

Though the dissection used in this formula is only approximate, the error becomes smaller and smaller as the circle is partitioned into more and more sectors. The limit of the areas of the approximate parallelograms is exactly π*r*^{2}, which is the area of the circle.^{ [25] }

This argument is actually a simple application of the ideas of calculus. In ancient times, the method of exhaustion was used in a similar way to find the area of the circle, and this method is now recognized as a precursor to integral calculus. Using modern methods, the area of a circle can be computed using a definite integral:

The formula for the area enclosed by an ellipse is related to the formula of a circle; for an ellipse with semi-major and semi-minor axes *x* and *y* the formula is:^{ [2] }

Most basic formulas for surface area can be obtained by cutting surfaces and flattening them out. For example, if the side surface of a cylinder (or any prism) is cut lengthwise, the surface can be flattened out into a rectangle. Similarly, if a cut is made along the side of a cone, the side surface can be flattened out into a sector of a circle, and the resulting area computed.

The formula for the surface area of a sphere is more difficult to derive: because a sphere has nonzero Gaussian curvature, it cannot be flattened out. The formula for the surface area of a sphere was first obtained by Archimedes in his work * On the Sphere and Cylinder *. The formula is:^{ [6] }

*A*= 4*πr*^{2}(sphere),

where *r* is the radius of the sphere. As with the formula for the area of a circle, any derivation of this formula inherently uses methods similar to calculus.

- A triangle: (where
*B*is any side, and*h*is the distance from the line on which*B*lies to the other vertex of the triangle). This formula can be used if the height*h*is known. If the lengths of the three sides are known then*Heron's formula*can be used: where*a*,*b*,*c*are the sides of the triangle, and is half of its perimeter.^{ [2] }If an angle and its two included sides are given, the area is where*C*is the given angle and*a*and*b*are its included sides.^{ [2] }If the triangle is graphed on a coordinate plane, a matrix can be used and is simplified to the absolute value of . This formula is also known as the shoelace formula and is an easy way to solve for the area of a coordinate triangle by substituting the 3 points*(x*,_{1},y_{1})*(x*, and_{2},y_{2})*(x*. The shoelace formula can also be used to find the areas of other polygons when their vertices are known. Another approach for a coordinate triangle is to use calculus to find the area._{3},y_{3}) - A simple polygon constructed on a grid of equal-distanced points (i.e., points with integer coordinates) such that all the polygon's vertices are grid points: , where
*i*is the number of grid points inside the polygon and*b*is the number of boundary points. This result is known as Pick's theorem.^{ [26] }

- The area between a positive-valued curve and the horizontal axis, measured between two values
*a*and*b*(b is defined as the larger of the two values) on the horizontal axis, is given by the integral from*a*to*b*of the function that represents the curve:^{ [1] }

- The area between the graphs of two functions is equal to the integral of one function,
*f*(*x*), minus the integral of the other function,*g*(*x*):

- where is the curve with the greater y-value.

- An area bounded by a function expressed in polar coordinates is:
^{ [1] }

- The area enclosed by a parametric curve with endpoints is given by the line integrals:

- or the
*z*-component of - (For details, see Green's theorem § Area calculation.) This is the principle of the planimeter mechanical device.

To find the bounded area between two quadratic functions, we subtract one from the other to write the difference as

where *f*(*x*) is the quadratic upper bound and *g*(*x*) is the quadratic lower bound. Define the discriminant of *f*(*x*)-*g*(*x*) as

By simplifying the integral formula between the graphs of two functions (as given in the section above) and using Vieta's formula, we can obtain^{ [27] }^{ [28] }

The above remains valid if one of the bounding functions is linear instead of quadratic.

- Cone:
^{ [29] }, where*r*is the radius of the circular base, and*h*is the height. That can also be rewritten as^{ [29] }or where*r*is the radius and*l*is the slant height of the cone. is the base area while is the lateral surface area of the cone.^{ [29] } - cube: , where
*s*is the length of an edge.^{ [6] } - cylinder: , where
*r*is the radius of a base and*h*is the height. The*2r*can also be rewritten as*d*, where*d*is the diameter. - prism: 2B + Ph, where
*B*is the area of a base,*P*is the perimeter of a base, and*h*is the height of the prism. - pyramid: , where
*B*is the area of the base,*P*is the perimeter of the base, and*L*is the length of the slant. - rectangular prism: , where is the length,
*w*is the width, and*h*is the height.

The general formula for the surface area of the graph of a continuously differentiable function where and is a region in the xy-plane with the smooth boundary:

An even more general formula for the area of the graph of a parametric surface in the vector form where is a continuously differentiable vector function of is:^{ [8] }

Shape | Formula | Variables |
---|---|---|

Regular triangle (equilateral triangle) | is the length of one side of the triangle. | |

Triangle ^{ [1] } | is half the perimeter, , and are the length of each side. | |

Triangle ^{ [2] } | and are any two sides, and is the angle between them. | |

Triangle ^{ [1] } | and are the base and altitude (measured perpendicular to the base), respectively. | |

Isosceles triangle | is the length of one of the two equal sides and is the length of a different side. | |

Rhombus/Kite | and are the lengths of the two diagonals of the rhombus or kite. | |

Parallelogram | is the length of the base and is the perpendicular height. | |

Trapezoid | and are the parallel sides and the distance (height) between the parallels. | |

Regular hexagon | is the length of one side of the hexagon. | |

Regular octagon | is the length of one side of the octagon. | |

Regular polygon | is the side length and is the number of sides. | |

Regular polygon | is the perimeter and is the number of sides. | |

Regular polygon | is the radius of a circumscribed circle, is the radius of an inscribed circle, and is the number of sides. | |

Regular polygon | is the number of sides, is the side length, is the apothem, or the radius of an inscribed circle in the polygon, and is the perimeter of the polygon. | |

Circle | is the radius and the diameter. | |

Circular sector | and are the radius and angle (in radians), respectively and is the length of the perimeter. | |

Ellipse ^{ [2] } | and are the semi-major and semi-minor axes, respectively. | |

Total surface area of a cylinder | and are the radius and height, respectively. | |

Lateral surface area of a cylinder | and are the radius and height, respectively. | |

Total surface area of a sphere ^{ [6] } | and are the radius and diameter, respectively. | |

Total surface area of a pyramid ^{ [6] } | is the base area, is the base perimeter and is the slant height. | |

Total surface area of a pyramid frustum ^{ [6] } | is the base area, is the base perimeter and is the slant height. | |

Square to circular area conversion | is the area of the square in square units. | |

Circular to square area conversion | is the area of the circle in circular units. |

The above calculations show how to find the areas of many common shapes.

The areas of irregular polygons can be calculated using the "Surveyor's formula".^{ [25] }

The isoperimetric inequality states that, for a closed curve of length *L* (so the region it encloses has perimeter *L*) and for area *A* of the region that it encloses,

and equality holds if and only if the curve is a circle. Thus a circle has the largest area of any closed figure with a given perimeter.

At the other extreme, a figure with given perimeter *L* could have an arbitrarily small area, as illustrated by a rhombus that is "tipped over" arbitrarily far so that two of its angles are arbitrarily close to 0° and the other two are arbitrarily close to 180°.

For a circle, the ratio of the area to the circumference (the term for the perimeter of a circle) equals half the radius *r*. This can be seen from the area formula *πr*^{2} and the circumference formula 2*πr*.

The area of a regular polygon is half its perimeter times the apothem (where the apothem is the distance from the center to the nearest point on any side).

Doubling the edge lengths of a polygon multiplies its area by four, which is two (the ratio of the new to the old side length) raised to the power of two (the dimension of the space the polygon resides in). But if the one-dimensional lengths of a fractal drawn in two dimensions are all doubled, the spatial content of the fractal scales by a power of two that is not necessarily an integer. This power is called the fractal dimension of the fractal. ^{ [30] }

There are an infinitude of lines that bisect the area of a triangle. Three of them are the medians of the triangle (which connect the sides' midpoints with the opposite vertices), and these are concurrent at the triangle's centroid; indeed, they are the only area bisectors that go through the centroid. Any line through a triangle that splits both the triangle's area and its perimeter in half goes through the triangle's incenter (the center of its incircle). There are either one, two, or three of these for any given triangle.

Any line through the midpoint of a parallelogram bisects the area.

All area bisectors of a circle or other ellipse go through the center, and any chords through the center bisect the area. In the case of a circle they are the diameters of the circle.

Given a wire contour, the surface of least area spanning ("filling") it is a minimal surface. Familiar examples include soap bubbles.

The question of the filling area of the Riemannian circle remains open.^{ [31] }

The circle has the largest area of any two-dimensional object having the same perimeter.

A cyclic polygon (one inscribed in a circle) has the largest area of any polygon with a given number of sides of the same lengths.

A version of the isoperimetric inequality for triangles states that the triangle of greatest area among all those with a given perimeter is equilateral.^{ [32] }

The triangle of largest area of all those inscribed in a given circle is equilateral; and the triangle of smallest area of all those circumscribed around a given circle is equilateral.^{ [33] }

The ratio of the area of the incircle to the area of an equilateral triangle, , is larger than that of any non-equilateral triangle.^{ [34] }

The ratio of the area to the square of the perimeter of an equilateral triangle, is larger than that for any other triangle.^{ [32] }

- Brahmagupta quadrilateral, a cyclic quadrilateral with integer sides, integer diagonals, and integer area.
- Equiareal map
- Heronian triangle, a triangle with integer sides and integer area.
- List of triangle inequalities
- One-seventh area triangle, an inner triangle with one-seventh the area of the reference triangle.

- Routh's theorem, a generalization of the one-seventh area triangle.

- Orders of magnitude—A list of areas by size.
- Derivation of the formula of a pentagon
- Planimeter, an instrument for measuring small areas, e.g. on maps.
- Area of a convex quadrilateral
- Robbins pentagon, a cyclic pentagon whose side lengths and area are all rational numbers.

In geometry, the **circumference** is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure. Circumference may also refer to the circle itself, that is, the locus corresponding to the edge of a disk.

A **circle** is a shape consisting of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant. The distance between any point of the circle and the centre is called the radius. This article is about circles in Euclidean geometry, and, in particular, the Euclidean plane, except where otherwise noted.

In geometry, a **polygon** is a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or *polygonal circuit*. The solid plane region, the bounding circuit, or the two together, may be called a polygon.

A **perimeter** is either a path that encompasses/surrounds/outlines a shape or its length (one-dimensional). The perimeter of a circle or an ellipse is called its circumference.

A **quadrilateral** is a polygon in Euclidean plane geometry with four edges (sides) and four vertices (corners). Other names for quadrilateral include **quadrangle**, **tetragon**, and **4-gon**. A quadrilateral with vertices , , and is sometimes denoted as .

A **triangle** is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices *A*, *B*, and *C* is denoted .

In geometry, a **solid angle** is a measure of the amount of the field of view from some particular point that a given object covers. That is, it is a measure of how large the object appears to an observer looking from that point. The point from which the object is viewed is called the *apex* of the solid angle, and the object is said to *subtend* its solid angle from that point.

In plane Euclidean geometry, a **rhombus** is a quadrilateral whose four sides all have the same length. Another name is **equilateral quadrilateral**, since equilateral means that all of its sides are equal in length. The rhombus is often called a **diamond**, after the diamonds suit in playing cards which resembles the projection of an octahedral diamond, or a **lozenge**, though the former sometimes refers specifically to a rhombus with a 60° angle, and the latter sometimes refers specifically to a rhombus with a 45° angle.

In mathematics and physics, the **centroid** or **geometric center** of a plane figure is the arithmetic mean position of all the points in the figure. Informally, it is the point at which a cutout of the shape could be perfectly balanced on the tip of a pin.

* The Method of Mechanical Theorems*, also referred to as

In mathematics, engineering, and manufacturing, a **solid of revolution** is a solid figure obtained by rotating a plane curve around some straight line that lies on the same plane.

A **surface of revolution** is a surface in Euclidean space created by rotating a curve around an axis of rotation.

In mathematics, a **semicircle** is a one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180°. It has only one line of symmetry. In non-technical usage, the term "semicircle" is sometimes used to refer to a half-disk, which is a two-dimensional geometric shape that also includes the diameter segment from one end of the arc to the other as well as all the interior points.

In geometry, a **square** is a regular quadrilateral, which means that it has four equal sides and four equal angles. It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices *ABCD* would be denoted *ABCD*.

A **cone** is a three-dimensional geometric shape that tapers smoothly from a flat base to a point called the apex or vertex.

A **cylinder** has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. It is the idealized version of a solid physical tin can having lids on top and bottom.

In geometry, the area enclosed by a circle of radius r is π*r*^{2}. Here the Greek letter π represents the constant ratio of the circumference of any circle to its diameter, approximately equal to 3.14159.

A **circular sector** or **circle sector**, is the portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector. In the diagram, θ is the central angle, the radius of the circle, and is the arc length of the minor sector.

In geometry, **Cavalieri's principle**, a modern implementation of the **method of indivisibles**, named after Bonaventura Cavalieri, is as follows:

In Euclidean geometry, an **equidiagonal quadrilateral** is a convex quadrilateral whose two diagonals have equal length. Equidiagonal quadrilaterals were important in ancient Indian mathematics, where quadrilaterals were classified first according to whether they were equidiagonal and then into more specialized types.

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*A History of the Calculus and Its Conceptual Development*. Dover. ISBN 978-0-486-60509-8. - 1 2 3 4 5 6 Weisstein, Eric W. "Surface Area". Wolfram MathWorld. Archived from the original on 23 June 2012. Retrieved 3 July 2012.
- ↑ Foundation, CK-12. "Surface Area".
*CK-12 Foundation*. Retrieved 2018-10-09. - 1 2 do Carmo, Manfredo (1976).
*Differential Geometry of Curves and Surfaces*. Prentice-Hall. p. 98, ISBN 978-0-13-212589-5 - ↑ Walter Rudin (1966).
*Real and Complex Analysis*, McGraw-Hill, ISBN 0-07-100276-6. - ↑ Gerald Folland (1999).
*Real Analysis: modern techniques and their applications*, John Wiley & Sons, Inc., p. 20, ISBN 0-471-31716-0 - ↑ Apostol, Tom (1967).
*Calculus*. I: One-Variable Calculus, with an Introduction to Linear Algebra. pp. 58–59. ISBN 9780471000051. - ↑ Moise, Edwin (1963).
*Elementary Geometry from an Advanced Standpoint*. Addison-Wesley Pub. Co. Retrieved 15 July 2012. - 1 2 3 4 Bureau international des poids et mesures (2006). "The International System of Units (SI)" (PDF). 8th ed. Archived (PDF) from the original on 2013-11-05. Retrieved 2008-02-13.Cite journal requires
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(help) Chapter 5. - ↑ Heath, Thomas L. (2003),
*A Manual of Greek Mathematics*, Courier Dover Publications, pp. 121–132, ISBN 978-0-486-43231-1, archived from the original on 2016-05-01 - ↑ Stewart, James (2003).
*Single variable calculus early transcendentals*(5th. ed.). Toronto ON: Brook/Cole. p. 3. ISBN 978-0-534-39330-4.However, by indirect reasoning, Eudoxus (fifth century B.C.) used exhaustion to prove the familiar formula for the area of a circle:

- 1 2 Arndt, Jörg; Haene l, Christoph (2006).
*Pi Unleashed*. Springer-Verlag. ISBN 978-3-540-66572-4 . Retrieved 2013-06-05. English translation by Catriona and David Lischka. - ↑ Eves, Howard (1990),
*An Introduction to the History of Mathematics*(6th ed.), Saunders, p. 121, ISBN 978-0-03-029558-4 - ↑ Heath, Thomas L. (1921).
*A History of Greek Mathematics (Vol II)*. Oxford University Press. pp. 321–323. - ↑ Weisstein, Eric W. "Heron's Formula".
*MathWorld*. - ↑ Bourke, Paul (July 1988). "Calculating The Area And Centroid Of A Polygon" (PDF). Archived (PDF) from the original on 2012-09-16. Retrieved 6 Feb 2013.
- ↑ "Area of Parallelogram/Rectangle". ProofWiki.org. Archived from the original on 20 June 2015. Retrieved 29 May 2016.
- ↑ "Area of Square". ProofWiki.org. Archived from the original on 4 November 2017. Retrieved 29 May 2016.
- ↑ Averbach, Bonnie; Chein, Orin (2012),
*Problem Solving Through Recreational Mathematics*, Dover, p. 306, ISBN 978-0-486-13174-0, archived from the original on 2016-05-13 - ↑ Joshi, K. D. (2002),
*Calculus for Scientists and Engineers: An Analytical Approach*, CRC Press, p. 43, ISBN 978-0-8493-1319-6, archived from the original on 2016-05-05 - 1 2 Braden, Bart (September 1986). "The Surveyor's Area Formula" (PDF).
*The College Mathematics Journal*.**17**(4): 326–337. doi:10.2307/2686282. JSTOR 2686282. Archived (PDF) from the original on 27 June 2012. Retrieved 15 July 2012. - ↑ Trainin, J. (November 2007). "An elementary proof of Pick's theorem".
*Mathematical Gazette*.**91**(522): 536–540. doi:10.1017/S0025557200182270. - ↑
*Matematika*. PT Grafindo Media Pratama. pp. 51–. ISBN 978-979-758-477-1. Archived from the original on 2017-03-20. - ↑
*Get Success UN +SPMB Matematika*. PT Grafindo Media Pratama. pp. 157–. ISBN 978-602-00-0090-9. Archived from the original on 2016-12-23. - 1 2 3 Weisstein, Eric W. "Cone". Wolfram MathWorld. Archived from the original on 21 June 2012. Retrieved 6 July 2012.
- ↑ Mandelbrot, Benoît B. (1983).
*The fractal geometry of nature*. Macmillan. ISBN 978-0-7167-1186-5. Archived from the original on 20 March 2017. Retrieved 1 February 2012. - ↑ Gromov, Mikhael (1983), "Filling Riemannian manifolds",
*Journal of Differential Geometry*,**18**(1): 1–147, CiteSeerX 10.1.1.400.9154 , doi:10.4310/jdg/1214509283, MR 0697984, archived from the original on 2014-04-08 - 1 2 Chakerian, G.D. (1979) "A Distorted View of Geometry." Ch. 7 in
*Mathematical Plums*. R. Honsberger (ed.). Washington, DC: Mathematical Association of America, p. 147. - ↑ Dorrie, Heinrich (1965),
*100 Great Problems of Elementary Mathematics*, Dover Publ., pp. 379–380. - ↑ Minda, D.; Phelps, S. (October 2008). "Triangles, ellipses, and cubic polynomials".
*American Mathematical Monthly*.**115**(8): 679–689: Theorem 4.1. doi:10.1080/00029890.2008.11920581. JSTOR 27642581. S2CID 15049234. Archived from the original on 2016-11-04.

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