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elongated pyramid : ウィキペディア英語版 | elongated pyramid
In geometry, the elongated pyramids are an infinite set of polyhedra, constructed by adjoining an n-gonal pyramid to an n-gonal prism. Along with the set of pyramids, these figures are topologically self-dual. There are three ''elongated pyramids'' that are Johnson solids made from regular triangles and square, and pentagons. Higher forms can be constructed with isosceles triangles. == Forms ==
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