Biography of Pyramid
<b>pyramid</b> (from Greek <b>''???????o?</b>'' - pyramidos, genitive of ''???????'' - pyramis) is any three-dimensional polyhedron where the faces other than the base are triangular and converge on one point, called the apex. The base of a pyramid can be any polygon but is typically a square, leading to four non-base faces. <br />
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A pyramid is said to be ''regular'' if its base is a regular polygon and its upper faces are congruent isosceles triangles.<br />
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Cutting off the top of a pyramid, using a plane parallel to the plane of the base, leaves a frustum of a pyramid, sometimes called a flat-topped pyramid, though it no longer satisfies the definition of a pyramid.<br />
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