Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An n-agonal bifrustum (or truncated bipyramid) is a polyhedron composed of three parallel planes of n-agons, with the middle plane largest and usually the top and bottom congruent. It can be constructed as two congruent frustum combined across a plane of symmetry, and also as a bipyramid with the two polar vertices truncated. They are duals to the family of elongated bipyramids.

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