1. BipyramidAn n-gonal bipyramid or dipyramid is a polyhedron formed by joining an n-gonal pyramid and its mirror image base-to-base. The referenced n-gon in the name of the bipyramids is not an external face but an internal one, existing on the primary symmetry plane which connects the two pyramid halves. The face-transitive bipyramids are the dual polyhedra of the uniform prisms and will generally have isosceles triangle faces.
Read “Bipyramid” on English Wikipedia
Read “双角錐” on Japanese Wikipedia
Read “Bipyramid” on DBpedia
Read “Bipyramid” on English Wikipedia
Read “双角錐” on Japanese Wikipedia
Read “Bipyramid” on DBpedia
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