Compound of dodecahedron and icosahedron
First stellation of icosidodecahedron | |
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Type | Dual compound |
Coxeter diagram | ![]() ![]() ![]() ![]() ![]() ![]() |
Stellation core | icosidodecahedron |
Convex hull | Rhombic triacontahedron |
Index | W47 |
Polyhedra | 1 icosahedron 1 dodecahedron |
Faces | 20 triangles 12 pentagons |
Edges | 60 |
Vertices | 32 |
Symmetry group | icosahedral (Ih) |
In geometry, this polyhedron can be seen as either a polyhedral stellation or a compound.
As a compound
[edit]It can be seen as the compound of an icosahedron and dodecahedron. It is one of four compounds constructed from a Platonic solid or Kepler-Poinsot solid, and its dual.
It has icosahedral symmetry (Ih) and the same vertex arrangement as a rhombic triacontahedron.
This can be seen as the three-dimensional equivalent of the compound of two pentagons ({10/2} "decagram"); this series continues into the fourth dimension as the compound of 120-cell and 600-cell and into higher dimensions as compounds of hyperbolic tilings.
A dodecahedron and its dual icosahedron | The intersection of both solids is the icosidodecahedron, and their convex hull is the rhombic triacontahedron. |
The decagon on the right is the Petrie polygon of both solids.
As a stellation
[edit]This polyhedron is the first stellation of the icosidodecahedron, and given as Wenninger model index 47.
The stellation facets for construction are:
In popular culture
[edit]In the film Tron (1982), the character Bit took this shape when not speaking.
In the cartoon series Steven Universe (2013-2019), Steven's shield bubble, briefly used in the episode Change Your Mind, had this shape.
See also
[edit]- Compound of two tetrahedra
- Compound of cube and octahedron
- Compound of small stellated dodecahedron and great dodecahedron
- Compound of great stellated dodecahedron and great icosahedron
References
[edit]- Wenninger, Magnus (1974). Polyhedron Models. Cambridge University Press. ISBN 0-521-09859-9.