The pyramidalfrustaare a subclass of the prismatoids.
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It can be constructed as two congruentfrustacombined across a plane of symmetry, and also as a bipyramid with the two polar vertices truncated.
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Cones and pyramids can be viewed as degenerate cases offrusta, where one of the cutting planes passes through the apex (so that the corresponding base reduces to a point).
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