Pentagonal-great enneagrammic duoprism |
---|
|
Rank | 4 |
---|
Type | Uniform |
---|
Notation |
---|
Bowers style acronym | Pagstedip |
---|
Coxeter diagram | x5o x9/4o () |
---|
Elements |
---|
Cells | 9 pentagonal prisms, 5 great enneagrammic prisms |
---|
Faces | 45 squares, 9 pentagons, 5 great enneagrams |
---|
Edges | 45+45 |
---|
Vertices | 45 |
---|
Vertex figure | Digonal disphenoid, edge lengths (1+√5)/2 (base 1), 2cos(4π/9) (base 2), √2 (sides) |
---|
Measures (edge length 1) |
---|
Circumradius | |
---|
Hypervolume | |
---|
Dichoral angles | Gistep–9/4–gistep: 108° |
---|
| Pip–4–gistep: 90° |
---|
| Pip–5–pip: 20° |
---|
Central density | 4 |
---|
Number of external pieces | 23 |
---|
Level of complexity | 12 |
---|
Related polytopes |
---|
Army | Semi-uniform peendip |
---|
Regiment | Pagstedip |
---|
Dual | Pentagonal-great enneagrammic duotegum |
---|
Conjugates | Pentagonal-enneagonal duoprism, Pentagonal-enneagrammic duoprism, Pentagrammic-enneagonal duoprism, Pentagrammic-enneagrammic duoprism, Pentagrammic-great enneagrammic duoprism |
---|
Abstract & topological properties |
---|
Euler characteristic | 0 |
---|
Orientable | Yes |
---|
Properties |
---|
Symmetry | H2×I2(9), order 180 |
---|
Convex | No |
---|
Nature | Tame |
---|
The pentagonal-great enneagrammic duoprism, also known as pagstedip or the 5-9/4 duoprism, is a uniform duoprism that consists of 9 pentagonal prisms and 5 great enneagrammic prisms, with two of each at each vertex.
The vertex coordinates of a pentagonal-great enneagrammic duoprism, centered at the origin and with edge length 2sin(4π/9), are given by:
where j = 2, 4, 8.