Elongated bipyramid

Elongated bipyramid
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

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).

There are three elongated bipyramids that are Johnson solids:

Elongated triangular bipyramid ( $J 14$ ),
Elongated square bipyramid ( $J 15$ ), and
Elongated pentagonal bipyramid ( $J 16$ ).

Higher forms can be constructed with isosceles triangles.

Elongated bipyramid
Example: elongated hexagonal bipyramid
Faces	$2n$ triangles $n$ squares
Edges	$5 n$
Vertices	$2 n + 2$
Symmetry group	$D nh, [n,2], (* n 22)$
Rotation group	$D n, [n,2] +, (n 22)$
Dual polyhedron	bifrustums
Properties	convex