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
TypePrismatic uniform polyhedron
ElementsF = 24, E = 44
V = 22 (χ = 2)
Faces by sides22{3}+2{11}
Schläfli symbols{2,22}
sr{2,11}
Wythoff symbol| 2 2 11
Coxeter diagram
Symmetry groupD11d, [2+,22], (2*11), order 44
Rotation groupD11, [11,2]+, (11.2.2), order 22
ReferencesU77(i)
DualHendecagonal trapezohedron
Propertiesconvex

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

  • Weisstein, Eric W. "Antiprism". MathWorld.
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