Heptagrammic retroprism
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| Heptagrammic retroprism | |
|---|---|
| File:7'5-ap.png | |
| Rank | 3 |
| Type | Isogonal |
| Elements | |
| Faces | 14 isosceles triangles, 2 heptagrams |
| Edges | 14+14 |
| Vertices | 14 |
| Vertex figure | Crossed isosceles trapezoid |
| Related polytopes | |
| Army | Heap |
| Regiment | * |
| Dual | Heptagrammic concave antitegum |
| Conjugates | Heptagonal antiprism, great heptagrammic antiprism |
| Abstract & topological properties | |
| Euler characteristic | 2 |
| Orientable | Yes |
| Genus | 0 |
| Properties | |
| Symmetry | I2(14)×A1/2, order 28 |
| Convex | No |
| Nature | Tame |
The heptagonal retroprism, also called the heptagrammic crossed antiprism, is a prismatic isogonal polyhedron. It consists of 2 base heptagrams and 14 isosceles triangles. Each vertex joins one heptagram and three triangles. It is a crossed antiprism based on a heptagram, seen as a 7/5-gon rather than 7/2. It cannot be made uniform.
It is isomorphic to the heptagonal antiprism.
Related polyhedra[edit | edit source]
There are an infinite amount of prismatic isogonal compounds that are the crossed antiprisms of compounds of heptagrams.
External links[edit | edit source]
- Klitzing, Richard. "n/d-ap".