Elongated bipyramid
In geometry, the elongated bipyramids are an infinite set of polyhedra, constructed by elongating an n-gonal bipyramid (by inserting an n-gonal prism between its congruent halves).
| Elongated bipyramid | |
|---|---|
Example: elongated hexagonal bipyramid | |
| Faces | 2n triangles n squares |
| Edges | 5n |
| Vertices | 2n + 2 |
| Symmetry group | Dnh, [n,2], (*n22) |
| Rotation group | Dn, [n,2]+, (n22) |
| Dual polyhedron | bifrustums |
| Properties | convex |
There are three elongated bipyramids that are Johnson solids:
- Elongated triangular bipyramid (J14),
- Elongated square bipyramid (J15), and
- Elongated pentagonal bipyramid (J16).
Higher forms can be constructed with isosceles triangles.
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