| Enneagonal antiprism | |
|---|---|
| Type | Convex semiregular polyhedron |
| Faces | 2 Enneagons 18 triangles |
| Edges | 36 |
| Vertices | 18 |
| Vertex configuration | 9.3.3.3 |
| Wythoff symbol | |2 2 9 |
| Symmetry group | D9d |
| Dual polyhedron | Enneagonal deltohedron |
| Properties | Convex |
| Vertex figure | |
In geometry, the enneagonal antiprism is one in an infinite set of convex antiprisms formed by triangle sides and two regular polygon caps, in this case two enneagons.