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出典:Wikipedia
出典:『Wikipedia』 (2011/06/18 18:05 UTC 版)
In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.
名詞の変化形:
Octahedron