: Mathématiques: pyramid

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pyramid

In geometry, a pyramid (from Ancient Greek πυραμίς (puramís)) is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base. A pyramid with an n-sided base has n + 1 vertices, n + 1 faces, and 2n edges. All pyramids are self-dual.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Pyramid_(geometry))

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