Bipyramid
A
bipyramid
is a
polyhedron
formed by joining two identical
pyramids
base-to-base. The bipyramids are the dual polyhedra of the
prisms
. Three bipyramids can be made out of all regular triangles, the
octahedron
(square bipyramid), which counts among the
Platonic solids
, and the
triangular
and
pentagonal
bipyramids, which count among the
Johnson solids
.
External links
The Uniform Polyhedra
Virtual Reality Polyhedra
The Encyclopedia of Polyhedra
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