Rectified truncated icosahedron

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Rectified truncated icosahedron
Rectified truncated icosahedron.png
Type Near-miss Johnson solid
Faces 92:
60 isosceles triangles
12 pentagons
20 hexagons
Edges 180
Vertices 90
Vertex configuration 3.6.3.6 (3.6)^2 vertex.svg
3.5.3.6 3.5.3.6 vertex.svg
Schläfli symbol rt{3,5}
Conway notation atI [1]
Symmetry group Ih, [5,3], (*532) order 120
Rotation group I, [5,3]+, (532), order 60
Dual polyhedron Rhombic enneacontahedron
Properties convex
Net
Rectified truncated icosahedron net.png

In geometry, the rectified truncated icosahedron is a convex polyhedron. It has 92 faces: 60 isosceles triangles, 12 regular pentagons, and 20 regular hexagons. It is constructed as a rectified, truncated icosahedron, rectification truncating vertices down to mid-edges.

Contents

As a near-miss Johnson solid, under icosahedral symmetry, the pentagons are always regular, although the hexagons, while having equal edge lengths, do not have the same edge lengths with the pentagons, having slightly different but alternating angles, causing the triangles to be isosceles instead. The shape is a symmetrohedron with notation I(1,2,*,[2])

Images

Jie Jiao Ban Zheng San Shi Er Mian Ti .gif

Dual

By Conway polyhedron notation, the dual polyhedron can be called a joined truncated icosahedron, jtI, but it is topologically equivalent to the rhombic enneacontahedron with all rhombic faces.

The rectified truncated icosahedron can be seen in sequence of rectification and truncation operations from the truncated icosahedron. Further truncation, and alternation operations creates two more polyhedra:

Name Truncated
icosahedron
Truncated
truncated
icosahedron
Rectified
truncated
icosahedron
Cantellated
truncated
icosahedron
Cantitruncated
truncated
icosahedron
Snub
truncated
icosahedron
Coxeter tI ttI rtIrrtItrtIsrtI
Conway atI etI btI stI
Image Uniform polyhedron-53-t12.svg Truncated truncated icosahedron.png Rectified truncated icosahedron.png Expanded truncated icosahedron.png Truncated rectified truncated icosahedron.png Snub rectified truncated icosahedron.png
Net Truncated icosahedron flat.png Truncated truncated icosahedron net.png Rectified truncated icosahedron net.png Expanded truncated icosahedron net.png Snub rectified truncated icosahedron net.png
Conway dtI = kD kD kdtI jtI otI mtI gtI
Dual Pentakis dodecahedron.png Kissed kissed dodecahedron.png Joined truncated icosahedron.png Ortho truncated icosahedron.png Meta truncated icosahedron.png Gyro truncated icosahedron.png
Net Pentakisdodecahedron net.png Kissed kissed dodecahedron net.png Rhombic enneacontahedron flat.png Ortho truncated icosahedron net.png Gyro truncated icosahedron net.png

See also

References

  1. "PolyHédronisme".