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Reference.org
Elongated triangular bipyramid
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the elongated triangular <a href="/facts/Bipyramid/MkzrCA0W">bipyramid</a> (or dipyramid) or triakis triangular prism a polyhedron constructed from a <a href="/facts/Triangular_prism/Yjp4Kw9M">triangular prism</a> by attaching two <a href="/facts/Tetrahedron/7mkSrl6j">tetrahedrons</a> to its bases. It is an example of <a href="/facts/Johnson_solid/8SR7CyNz">Johnson solid</a>. </p>