Pentagonal dipyramid
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 solid (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.

Pentagonal dipyramid.png
The Johnson solid 13 is made of 10 equilateral triangles.

External links

eo:Kvinlatera dupiramido nl:Vijfhoekige bipiramide pt:Bipirâmide pentagonal th:พีระมิดคู่ห้าเหลี่ยม

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