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This is an AoPSWiki Word of the Week for Sep 6-12

A pyramid is a 3-dimensional geometric solid. It consists of a base that is a polygon and a vertex in a plane other than the plane of the polygon. The edges of the pyramid are the sides of the polygonal base together with line segments connected the vertex of the pyramid to each vertex of the polygon.

The area of a pyramid is given by the formula $\frac13bh$, where $b$ is the area of the base and $h$ is the height.

AoPSWiki Words of the Week for Sep 6-12
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