Pentagonal prism
Uniform pentagonal prism | |
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Type | Prismatic uniform polyhedron |
Elements | F = 7, E = 15 V = 10 (χ = 2) |
Faces by sides | 5{4}+2{5} |
Schläfli symbol | t{2,5} or {5}×{} |
Wythoff symbol | 2 5 | 2 |
Coxeter diagram | ![]() ![]() ![]() ![]() ![]() |
Symmetry group | D5h, [5,2], (*522), order 20 |
Rotation group | D5, [5,2]+, (522), order 10 |
References | U76(c) |
Dual | Pentagonal dipyramid |
Properties | convex |
![]() Vertex figure 4.4.5 |
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Pentagonal_prism.stl/220px-Pentagonal_prism.stl.png)
In geometry, the pentagonal prism is a prism with a pentagonal base. It is a type of heptahedron with 7 faces, 15 edges, and 10 vertices.
As a semiregular (or uniform) polyhedron[]
If faces are all regular, the pentagonal prism is a semiregular polyhedron, more generally, a uniform polyhedron, and the third in an infinite set of prisms formed by square sides and two regular polygon caps. It can be seen as a truncated pentagonal hosohedron, represented by Schläfli symbol t{2,5}. Alternately it can be seen as the Cartesian product of a regular pentagon and a line segment, and represented by the product {5}x{}. The dual of a pentagonal prism is a pentagonal bipyramid.
The symmetry group of a right pentagonal prism is D5h of order 20. The rotation group is D5 of order 10.
Volume[]
The volume, as for all prisms, is the product of the area of the pentagonal base times the height or distance along any edge perpendicular to the base. For a uniform pentagonal prism with edges h the formula is
Use[]
Nonuniform pentagonal prisms called pentaprisms are also used in optics to rotate an image through a right angle without changing its chirality.
In 4-polytopes[]
It exists as cells of four nonprismatic uniform 4-polytopes in 4 dimensions:
cantellated 600-cell![]() ![]() ![]() ![]() ![]() ![]() ![]() |
cantitruncated 600-cell![]() ![]() ![]() ![]() ![]() ![]() ![]() |
runcinated 600-cell![]() ![]() ![]() ![]() ![]() ![]() ![]() |
runcitruncated 600-cell![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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Related polyhedra[]
- The pentagonal stephanoid has pentagonal dihedral symmetry and has the same vertices as the uniform pentagonal prism.
Prism name | Digonal prism | (Trigonal) Triangular prism |
(Tetragonal) Square prism |
Pentagonal prism | Hexagonal prism | Heptagonal prism | Octagonal prism | Enneagonal prism | Decagonal prism | Hendecagonal prism | Dodecagonal prism | ... | Apeirogonal prism |
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Polyhedron image | ![]() |
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Spherical tiling image | ![]() |
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Plane tiling image | ![]() | |||
Vertex config. | 2.4.4 | 3.4.4 | 4.4.4 | 5.4.4 | 6.4.4 | 7.4.4 | 8.4.4 | 9.4.4 | 10.4.4 | 11.4.4 | 12.4.4 | ... | ∞.4.4 |
Coxeter diagram | ![]() ![]() ![]() ![]() ![]() |
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External links[]
- Weisstein, Eric W. "Pentagonal prism". MathWorld.
- Pentagonal Prism Polyhedron Model -- works in your web browser
- Prismatoid polyhedra
- Polyhedron stubs