bipyramid(dipyramid)
基础科学

        Definition: An n-gonal bipyramid or dipyramid is a polyhedron formed by joining an ngonal pyramid and its mirror image base-to-base. The referenced n-gon in the name of thebipyramids is not an external face but an internal one,existing on the primary symm......（本文共 736 字）     [阅读本文] >>