- Triangular dipyramid
"For the related molecular geometry see
trigonal bipyramid molecular geometry "Infobox face-uniform polyhedron
Polyhedron_Type=Dipyramid
and
Johnson
J11 - J12 - J13
Face_List=6triangle s
Edge_Count=9
Vertex_Count=5
Symmetry_Group="D""3h"
Face_Type=V3.4.4
Dual=triangular prism
Property_List=convex,face-transitive Ingeometry , the triangular dipyramid (orbipyramid ) is the first in the infinite set offace-transitive dipyramid s. It is the dual of thetriangular prism with 6 isosceles triangle faces.It is also one of the
Johnson solid s, ("J"12) with equilateral triangle faces. As the name suggests, it can be constructed by joining two tetrahedra along one face. It is a convexdeltahedron . Although all its faces arecongruent and the solid isface-transitive , it is not aPlatonic solid because some vertices adjoin three faces and others adjoin four. As a Johnson solid, with 6 equilateral triangles, it is also in the set of deltahedra.External links
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** mathworld | urlname = TriangularDipyramid | title = Triangular dipyramid
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