Uniform hexagonal prism | |
---|---|
Type | Prismatic uniform polyhedron |
Elements | F = 8, E = 18, V = 12 (? = 2) |
Faces by sides | 6{4}+2{6} |
Schläfli symbol | t{2,6} or {6}×{} |
Wythoff symbol | 2 6 | 2 2 2 3 | |
Coxeter diagrams | |
Symmetry | D_{6h}, [6,2], (*622), order 24 |
Rotation group | D_{6}, [6,2]^{+}, (622), order 12 |
References | U_{76(d)} |
Dual | Hexagonal dipyramid |
Properties | convex, zonohedron |
Vertex figure 4.4.6 |
In geometry, the hexagonal prism is a prism with hexagonal base. This polyhedron has 8 faces, 18 edges, and 12 vertices.^{[1]}
Since it has 8 faces, it is an octahedron. However, the term octahedron is primarily used to refer to the regular octahedron, which has eight triangular faces. Because of the ambiguity of the term octahedron and tilarity of the various eight-sided figures, the term is rarely used without clarification.
Before sharpening, many pencils take the shape of a long hexagonal prism.^{[2]}
If faces are all regular, the hexagonal prism is a semiregular polyhedron, more generally, a uniform polyhedron, and the fourth in an infinite set of prisms formed by square sides and two regular polygon caps. It can be seen as a truncated hexagonal hosohedron, represented by Schläfli symbol t{2,6}. Alternately it can be seen as the Cartesian product of a regular hexagon and a line segment, and represented by the product {6}×{}. The dual of a hexagonal prism is a hexagonal bipyramid.
The symmetry group of a right hexagonal prism is D_{6h} of order 24. The rotation group is D_{6} of order 12.
As in most prisms, the volume is found by taking the area of the base, with a side length of , and multiplying it by the height , giving the formula:^{[3]}
The topology of a uniform hexagonal prism can have geometric variations of lower symmetry, including:
Name | Regular-hexagonal prism | Hexagonal frustum | Ditrigonal prism | Triambic prism | Ditrigonal trapezoprism |
---|---|---|---|---|---|
Symmetry | D_{6h}, [2,6], (*622) | C_{6v}, [6], (*66) | D_{3h}, [2,3], (*322) | D_{3d}, [2^{+},6], (2*3) | |
Construction | {6}×{}, | t{3}×{}, | s_{2}{2,6}, | ||
Image | |||||
Distortion |
It exists as cells of four prismatic uniform convex honeycombs in 3 dimensions:
Hexagonal prismatic honeycomb^{[1]} |
Triangular-hexagonal prismatic honeycomb |
Snub triangular-hexagonal prismatic honeycomb |
Rhombitriangular-hexagonal prismatic honeycomb |
It also exists as cells of a number of four-dimensional uniform 4-polytopes, including:
Uniform hexagonal dihedral spherical polyhedra | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Symmetry: [6,2], (*622) | [6,2]^{+}, (622) | [6,2^{+}], (2*3) | ||||||||||||
{6,2} | t{6,2} | r{6,2} | t{2,6} | {2,6} | rr{6,2} | tr{6,2} | sr{6,2} | s{2,6} | ||||||
Duals to uniforms | ||||||||||||||
V6^{2} | V12^{2} | V6^{2} | V4.4.6 | V2^{6} | V4.4.6 | V4.4.12 | V3.3.3.6 | V3.3.3.3 |
This polyhedron can be considered a member of a sequence of uniform patterns with vertex figure (4.6.2p) and Coxeter-Dynkin diagram . For p < 6, the members of the sequence are omnitruncated polyhedra (zonohedrons), shown below as spherical tilings. For p > 6, they are tilings of the hyperbolic plane, starting with the truncated triheptagonal tiling.
*n32 symmetry mutations of omnitruncated tilings: 4.6.2n | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Sym. *n32 [n,3] |
Spherical | Euclid. | Compact hyperb. | Paraco. | Noncompact hyperbolic | |||||||
*232 [2,3] |
*332 [3,3] |
*432 [4,3] |
*532 [5,3] |
*632 [6,3] |
*732 [7,3] |
*832 [8,3] |
*∞32 [∞,3] |
[12i,3] |
[9i,3] |
[6i,3] |
[3i,3] | |
Figures | ||||||||||||
Config. | 4.6.4 | 4.6.6 | 4.6.8 | 4.6.10 | 4.6.12 | 4.6.14 | 4.6.16 | 4.6.∞ | 4.6.24i | 4.6.18i | 4.6.12i | 4.6.6i |
Duals | ||||||||||||
Config. | V4.6.4 | V4.6.6 | V4.6.8 | V4.6.10 | V4.6.12 | V4.6.14 | V4.6.16 | V4.6.∞ | V4.6.24i | V4.6.18i | V4.6.12i | V4.6.6i |
Family of uniform prisms | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Polyhedron | |||||||||||
Coxeter | |||||||||||
Tiling | |||||||||||
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 |
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