Pentagonal dipyramid

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In geometry, the pentagonal dipyramid is one of the Johnson solids (J₁₃). As the name suggests, it can be constructed by joining two pentagonal pyramids (J₂) along their bases. It is a convex deltahedron. Although it is face-uniform, it is not a Platonic solid because some vertices have four faces meeting and others have five faces.

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

External link

• Johnson Solid -- from MathWorld

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