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square antiprism
In geometry, the square antiprism is the second in an infinite set of antiprisms formed by an even-numbered sequence of triangle sides closed by two polygon caps. It is also known as an ''anticube''.〔Holleman-Wiberg. ''Inorganic Chemistry'', Academic Press, Italy, p. 299. ISBN 0-12-352651-5.〕
If all its faces are regular, it is a semiregular polyhedron or uniform polyhedron.
== Points on a sphere==
When eight points are distributed on the surface of a sphere with the aim of maximising the distance between them in some sense, the resulting shape corresponds to a square antiprism rather than a cube. Specific methods of distributing the points include, for example, the Thomson problem (minimizing the sum of all the reciprocals of distances between points), maximising the distance of each point to the nearest point, or minimising the sum of all reciprocals of squares of distances between points.
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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