Pentakis icosidodecahedron explained

Type:Geodesic polyhedron (2,0)
Faces:80 triangles
(20 equilateral; 60 isosceles)
Edges:120 (2 types)
Vertices:42 (2 types)
Symmetry:Icosahedral
Dual:Chamfered dodecahedron
Properties:convex
Net:Pentakis icosidodecahedron net.png

In geometry, the pentakis icosidodecahedron or subdivided icosahedron is a convex polyhedron with 80 triangular faces, 120 edges, and 42 vertices. It is a dual of the truncated rhombic triacontahedron (chamfered dodecahedron).

Construction

Its name comes from a topological construction from the icosidodecahedron with the kis operator applied to the pentagonal faces. In this construction, all the vertices are assumed to be the same distance from the center, while in general icosahedral symmetry can be maintained even with the 12 order-5 vertices at a different distance from the center as the other 30.

It can also be topologically constructed from the icosahedron, dividing each triangular face into 4 triangles by adding mid-edge vertices. From this construction, all 80 triangles will be equilateral, but faces will be coplanar.

Conway(u2)I(k5)aI
Image
Form2-frequency subdivided icosahedronPentakis icosidodecahedron

Related polyhedra

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Related polytopes

It represents the exterior envelope of a vertex-centered orthogonal projection of the 600-cell, one of six convex regular 4-polytopes, into 3 dimensions.

See also

References

External links