Radian (disambiguation)

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Radian may refer to:

Radian SI derived unit of angle

The radian is the SI unit for measuring angles, and is the standard unit of angular measure used in many areas of mathematics. The length of an arc of a unit circle is numerically equal to the measurement in radians of the angle that it subtends; one radian is just under 57.3 degrees. The unit was formerly an SI supplementary unit, but this category was abolished in 1995 and the radian is now considered an SI derived unit.

Radian is an Austrian experimental music group.

<i>Radian</i> (EP) 2010 EP by Ana Free

Radian is the debut EP album by Portuguese singer Ana Free. It was released on February 9, 2010, in the U.S. and its lead single was "Questions in My Mind", released a week after.

See also

Steradian SI derived unit of solid angle

The steradian or square radian is the SI unit of solid angle. It is used in three-dimensional geometry, and is analogous to the radian, which quantifies planar angles. Whereas an angle in radians, projected onto a circle, gives a length on the circumference, a solid angle in steradians, projected onto a sphere, gives an area on the surface. The name is derived from the Greek στερεός stereos 'solid' + radian.

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