Triangular Dipyramid

In geometry, the triangular dipyramid is a polyhedron made entirely out of 6 faces, which are all equilateral triangles, 9 edges, and 5 vertexes. It is a convex deltahedron. It is one of the Johnson solids (J12). Although all faces are congruent and the solid is face-uniform, it is not a Platonic solid because some vertexes have three triangles at a point and others have four. The 92 Johnson solids were named and described by Norman Johnson in 1966.

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