Compound of six pentagonal antiprisms
| Compound of six pentagonal antiprisms | |
|---|---|
| |
| Type | Uniform compound |
| Index | UC27 |
| Polyhedra | 6 pentagonal antiprisms |
| Faces | 60 triangles, 12 pentagons |
| Edges | 120 |
| Vertices | 60 |
| Symmetry group | icosahedral (Ih) |
| Subgroup restricting to one constituent | 5-fold antiprismatic (D5d) |
File:Compound of six pentagonal antiprisms.stl
The compound of six pentagonal antiprisms is a uniform polyhedron compound. It's composed of a symmetric arrangement of 6 pentagonal antiprisms. It can be constructed by inscribing one pentagonal antiprism within an icosahedron in each of the six possible ways, and then rotating each by 36 degrees about its axis (that passes through the centres of the two opposite pentagonal faces).
It shares its vertex arrangement with the compound of six pentagrammic crossed antiprisms.
Cartesian coordinates[edit]
Cartesian coordinates for the vertices of this compound are all the cyclic permutations of
- (±(3 + 4τ), 0, ±(4 − 3τ))
- (±(2 − 4τ), ±5τ, ±(1 − 2τ))
- (±(2 + τ), ±5, ±(4 + 2τ))
where τ = (1 + √5)/2 is the golden ratio (sometimes written φ).
References[edit]
- Skilling, John (1976), "Uniform Compounds of Uniform Polyhedra", Mathematical Proceedings of the Cambridge Philosophical Society, 79: 447–457, doi:10.1017/S0305004100052440, MR 0397554.
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