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Normally, a convex polyhedron with two ‘end’ faces that are congruent regular polygons lying in parallel planes in such a way that, with each vertex of one polygon joined by an edge to two vertices of the other polygon, the remaining faces are isosceles triangles. The term could be used for a polyhedron of a similar sort in which the end faces are not regular and the triangular faces are not isosceles, in which case the first definition would be said to give a right-regular antiprism. If the end faces are regular and the triangular faces are equilateral, the antiprism is a semi-regular polygon.

Subjects: Mathematics.

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