Pentagonal dipyramid
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| Pentagonal dipyramid | |
|---|---|
 |
|
| Type | Johnson J12 - J13 - J14 |
| Faces | 10 triangles |
| Edges | 15 |
| Vertices | 7 |
| Face configuration | V4.4.5 |
| Symmetry group | D5h |
| Dual | pentagonal prism |
| Properties | convex, deltahedron, face-uniform |
In geometry, the pentagonal dipyramid (or bipyramid) 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.
