What is "antiprism"

n. A polyhedron composed of two parallel copies of some particular polygon, connected by an alternating band of triangles.

bgcolor=#e7dcc3 colspan=2|Set of uniform antiprisms

align=center colspan=2|

bgcolor=#e7dcc3|Type

bgcolor=#e7dcc3|Faces

bgcolor=#e7dcc3|Edges

bgcolor=#e7dcc3|Vertices

bgcolor=#e7dcc3| Conway polyhedron notation

bgcolor=#e7dcc3| Vertex configuration

bgcolor=#e7dcc3| Schläfli symbol

bgcolor=#e7dcc3| Coxeter diagrams

bgcolor=#e7dcc3| Symmetry group

bgcolor=#e7dcc3| Rotation group

bgcolor=#e7dcc3| Dual polyhedron

bgcolor=#e7dcc3|Properties

bgcolor=#e7dcc3| Net

In geometry, an n-sided antiprism is a polyhedron composed of two parallel copies of some particular n-sided polygon, connected by an alternating band of triangles. Antiprisms are a subclass of the prismatoids and are a (degenerate) type of snub polyhedra.

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 n-sided base, one usually considers the case where its copy is twisted by an angle . 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.