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Reference.org
Elongated triangular pyramid
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<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the elongated triangular pyramid is one of the <a href="/facts/Johnson_solid/8SR7CyNz">Johnson solids</a> (<i>J</i>7). As the name suggests, it can be constructed by elongating a <a href="/facts/Tetrahedron/7mkSrl6j">tetrahedron</a> by attaching a <a href="/facts/Triangular_prism/Yjp4Kw9M">triangular prism</a> to its base. Like any elongated <a href="/facts/Pyramid_(geometry)/fCXRgFwu">pyramid</a>, the resulting solid is topologically (but not geometrically) self-<a href="/facts/Dual_polyhedron/rkIHbmAf">dual</a>. </p>