Triangular dipyramid

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Face configuration||V3.4.4 |- |bgcolor=#e7dcc3|Symmetry group||D_3h |- |bgcolor=#e7dcc3|Dual||triangular prism |- |bgcolor=#e7dcc3|Properties||convex, deltahedron, face-uniform |}

In geometry, the triangular dipyramid (or bipyramid) is one of the Johnson solids (J₁₂). As the name suggests, it can be constructed by joining two tetrahedra along one face. It is a convex deltahedron. Although all its faces are congruent and the solid is face-uniform, it is not a Platonic solid because some vertices adjoin three faces and others adjoin four.

The 92 Johnson solids were named and described by Norman Johnson in 1966.

External link

• [Johnson Solid -- from MathWorld]

 

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Triangular dipyramid
Type	Johnson J11 - J12 - J13
Faces	6 triangles
Edges	9
Vertices	5

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