Editing Antiprism (section)

{{Short description|Polyhedron with parallel bases connected by triangles}}
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[[File:Octagonal antiprism.png|thumb|Octagonal antiprism]]
In [[geometry]], an '''{{nowrap|{{mvar|n}}-gonal}} antiprism''' or {{nowrap|'''{{mvar|n}}-antiprism'''}} is a [[polyhedron]] composed of two [[Parallel (geometry)|parallel]] [[Euclidean group|direct]] copies (not mirror images) of an {{nowrap|{{mvar|n}}-sided}} [[polygon]], connected by an alternating band of {{math|2''n''}} [[triangle]]s. They are represented by the [[Conway polyhedron notation|Conway notation]] {{math|A''n''}}.

Antiprisms are a subclass of [[prismatoid]]s, and are a (degenerate) type of [[snub polyhedron]].

Antiprisms are similar to [[Prism (geometry)|prisms]], except that the bases are twisted relatively to each other, and that the side faces (connecting the bases) are {{math|2''n''}} triangles, rather than {{mvar|n}} [[quadrilateral]]s.

The [[dual polyhedron]] of an {{mvar|n}}-gonal antiprism is an {{mvar|n}}-gonal [[trapezohedron]].