Compound of ten hexagonal prisms

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Compound of ten hexagonal prisms
Type	Uniform compound
Index	UC39
Polyhedra	10 hexagonal prisms
Faces	20 hexagons, 60 squares
Edges	180
Vertices	120
Symmetry group	icosahedral (Ih)
Subgroup restricting to one constituent	3-fold antiprismatic (D3d)

This uniform polyhedron compound is a symmetric arrangement of 10 hexagonal prisms, aligned with the axes of three-fold rotational symmetry of an icosahedron.

[edit] Cartesian coordinates

Cartesian coordinates for the vertices of this compound are all the cyclic permutations of

(±√3, ±(τ⁻¹−τ√3), ±(τ+τ⁻¹√3))

(±2√3, ±τ⁻¹, ±τ)

(±(1+√3), ±(1−τ√3), ±(1+τ⁻¹√3))

(±(τ−τ⁻¹√3), ±√3, ±(τ⁻¹+τ√3))

(±(1−τ⁻¹√3), ±(1−√3), ±(1+τ√3))

where τ = (1+√5)/2 is the golden ratio (sometimes written φ).

[edit] References

• John Skilling, Uniform Compounds of Uniform Polyhedra, Mathematical Proceedings of the Cambridge Philosophical Society, Vol. 79, pp. 447-457, 1976.