Hendecagonal antiprism
In geometry, the hendecagonal antiprism is the ninth in an infinite set of antiprisms formed by an even-numbered sequence of triangle sides closed by two polygon caps.
| Uniform hendecagonal antiprism | |
|---|---|
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| Type | Prismatic uniform polyhedron |
| Elements | F = 24, E = 44 V = 22 (χ = 2) |
| Faces by sides | 22{3}+2{11} |
| Schläfli symbol | s{2,22} sr{2,11} |
| Wythoff symbol | | 2 2 11 |
| Coxeter diagram |      |
| Symmetry group | D11d, [2+,22], (2*11), order 44 |
| Rotation group | D11, [11,2]+, (11.2.2), order 22 |
| References | U77(i) |
| Dual | Hendecagonal trapezohedron |
| Properties | convex |
 Vertex figure 3.3.3.11 | |
Antiprisms are similar to prisms except the bases are twisted relative to each other, and that the side faces are triangles, rather than quadrilaterals.
In the case of a regular 11-sided base, one usually considers the case where its copy is twisted by an angle 180°/n. Extra regularity is obtained by the line connecting the base centers being perpendicular to the base planes, making it a right antiprism. As faces, it has the two n-gonal bases and, connecting those bases, 2n isosceles triangles.
If faces are all regular, it is a semiregular polyhedron.
See also
| Family of uniform antiprisms n.3.3.3 | ||||||||||||
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| Config. | V2.3.3.3 | 3.3.3.3 | 4.3.3.3 | 5.3.3.3 | 6.3.3.3 | 7.3.3.3 | 8.3.3.3 | 9.3.3.3 | 10.3.3.3 | 11.3.3.3 | 12.3.3.3 | ...∞.3.3.3 |
External links
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