| 单词 | pyramid |
| 释义 | pyramid A solid having a polygonal base with n sides, each side forming the base of a triangle. The n triangles so formed have a common vertex. The axis of the pyramid is a line joining the vertex to the centre of symmetry of the base. If the axis is perpendicular to the base the solid is a right pyramid . A square pyramid has a square base and a triangular pyramid has a triangular base (see tetrahedron). The volume of a pyramid is one third of the base area multiplied by the height |
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