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Gyroelongated bipyramid
In geometry, the gyroelongated bipyramids are an infinite set of polyhedra, constructed by elongating an ''n''-gonal bipyramid by inserting an ''n''-gonal antiprism between its congruent halves.
==Forms==
Two members of the set can be deltahedra, that is, constructed entirely of equilateral triangles: the gyroelongated square bipyramid, a Johnson solid, and the icosahedron, a Platonic solid. The ''gyroelongated triangular bipyramid'' can be made with equilateral triangles, but is not a deltahedron because it has coplanar faces, i.e. is not strictly convex. With pairs of triangles merged into rhombi, it can be seen as a trigonal trapezohedron. The other members can be constructed with isosceles triangles.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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