Pentagonal dipyramid
From Wikipedia, the free encyclopedia
| Pentagonal dipyramid | |
|---|---|
 |
|
| Type | Dipyramid and Johnson J12 - J13 - J14 |
| Faces | 10 triangles |
| Edges | 15 |
| Vertices | 7 |
| Face configuration | V4.4.5 |
| Symmetry group | D5h |
| Dual | pentagonal prism |
| Properties | convex, face-transitive, (deltahedron) |
In geometry, the pentagonal dipyramid (or bipyramid) is third of the infinite set of face-transitive dipyramids.
The set of dipyramids is the dual of the uniform prisms.
It is also a Johnson solids (J13), constructed of regular polygons. It can be seen as two pentagonal pyramids (J2) connected along their bases.
As a Johnson solid, it is a convex deltahedron. Although it is face-transitive, it is not a Platonic solid because some vertices have four faces meeting and others have five faces.
The Johnson solid 13 is made of 10 equilateral triangles.
[edit] External link
[edit] External link
- Eric W. Weisstein, Dipyramid at MathWorld.
- Eric W. Weisstein, Pentagonal dipyramid at MathWorld.
