Compound of twelve pentagonal antiprisms
|Compound of twelve pentagonal antiprisms|
|Bowers style acronym||Gadsid|
|Components||12 pentagonal antiprisms|
|Faces||120 triangles, 24 pentagons as 12 stellated decagons|
|Vertex figure||Isosceles trapezoid, edge length 1, 1, 1, (1+√)/2|
|Measures (edge length 1)|
|Dual||Compound of twelve pentagonal antitegums|
|Conjugate||Compound of twelve pentagrammic retroprisms|
|Abstract & topological properties|
|Symmetry||H3, order 120|
The great disnub dodecahedron, gadsid, or compound of twelve pentagonal antiprisms is a uniform polyhedron compound. It consists of 120 triangles and 24 pentagons (which fall in pairs in the same plane and combine into 12 stellated decagons), with one pentagon and three triangles joining at a vertex.
This compound has rotational freedom, represented by an angle θ. We start at θ = 0° with all the pentagonal antiprisms inscribed in an icosahedron, and rotate pairs of antiprisms in opposite directions. At θ = 36° the antiprisms coincide by pairs, resulting in a double cover of the great snub dodecahedron.
Vertex coordinates[edit | edit source]
The vertices of a great disnub dodecahedron of edge length 1 and rotation angle θ are given by all even permutations of:
[edit | edit source]
- Bowers, Jonathan. "Polyhedron Category C8: Antiprismatics" (#49).
- Klitzing, Richard. "gadsid".
- Wikipedia Contributors. "Compound of twelve pentagonal antiprisms with rotational freedom".