Pyramid
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A pyramid is a solid whose base is a plan figure, and whose sides are triangles uniting at a common point, called the vertex. If a straight line be drawn on one of the sides of a pyramid from the vertex so as to be perpendicular to one edge of the base, this line is called the slant height.
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PyramidsSource
V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 20: page 27 in arithmetic section
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