Rectified truncated icosahedron

The rectified truncated icosahedron is a polyhedron, constructed as a rectified truncated icosahedron. 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.

Rectified truncated icosahedron
Schläfli symbolrt{3,5}
Conway notationatI[1]
Faces92:
60 { }∨( )
12 {5}
20 {6}
Edges180
Vertices90
Vertex figures3.6.3.6
3.5.3.6
Symmetry groupIh, [5,3], (*532) order 120
Rotation groupI, [5,3]+, (532), order 60
Dual polyhedronRhombic enneacontahedron
Propertiesconvex

Net

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.

Images

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		 Expanded
truncated
icosahedron		 Truncated
rectified
truncated
icosahedron		 Snub
rectified
truncated
icosahedron
Coxeter tI ttI rtI rrtI trtI srtI
Conway atI etI btI stI
Image
Net
Conway dtI = kD kD kdtI jtI jtI otI mtI gtI
Dual
Net

See also

References
  1. https://levskaya.github.io/polyhedronisme/?recipe=C400A1atI
  • Coxeter Regular Polytopes, Third edition, (1973), Dover edition, ISBN 0-486-61480-8 (pp. 145–154 Chapter 8: Truncation)
  • John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, The Symmetries of Things 2008, ISBN 978-1-56881-220-5
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.