Enneagonal prism
In geometry, the enneagonal prism (or nonagonal prism) is the seventh in an infinite set of prisms, formed by square sides and two regular enneagon caps.
| Enneagonal prism | |
|---|---|
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| Type | Uniform polyhedron |
| Faces | 2 Enneagons 9 squares |
| Edges | 27 |
| Vertices | 18 |
| Vertex configuration | 9.4.4 |
| Wythoff symbol | 2 9 | 2 |
| Coxeter diagram |     |
| Symmetry group | D9h, [9,2], (*922), order 36 |
| Rotation group | D9, [9,2]+, (922), order 18 |
| Dual polyhedron | Enneagonal dipyramid |
| Properties | convex semiregular |
| Vertex figure | |
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If faces are all regular, it is a semiregular polyhedron.
Related polyhedra
| Family of uniform n-gonal prisms | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prism name | Digonal prism | (Trigonal) Triangular prism |
(Tetragonal) Square prism |
Pentagonal prism | Hexagonal prism | Heptagonal prism | Octagonal prism | Enneagonal prism | Decagonal prism | Hendecagonal prism | Dodecagonal prism | ... | Apeirogonal prism |
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Plane tiling image |  | |||
| Vertex config. | 2.4.4 | 3.4.4 | 4.4.4 | 5.4.4 | 6.4.4 | 7.4.4 | 8.4.4 | 9.4.4 | 10.4.4 | 11.4.4 | 12.4.4 | ... | ∞.4.4 |
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