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Frustum of a pyramid

A frustum of a pyramid (or truncated pyramid) is a pyramid of which the tip has been cut off; hence it has two bases, one at the bottom and a smaller one at the top.

The two bases have the same shape, that is, if the lower base is a quadrilateral, for instance, then the upper base is also a quadrilateral.

However, the sizes of the two base are not the same.Drawing of a frustum pyramid

Because the two bases are parallel, the sides of the frustum consists of trapezoids.

The height of the frustum is the shortest distance between the two bases.