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Enneagrammic antiprism : ウィキペディア英語版 | Enneagrammic antiprism
In geometry, anenneagrammic antiprism is a star antiprism constructed by enneagrammic bases. There are two forms, built on the two enneagrams and , and one crossed form . A nonuniform 9/7 cross-antiprism can be constructed without equal edge-lengths. A 9/3 ratio is reducible and so represents a compound polyhedron of 3 triangular antiprisms with 120 degree rotations between them. == 9/2== The first solution is a 9/2 antiprism. == 9/4==
320px 9/4-antiprism
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