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Pyramid (geometry)
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<p>A pyramid is a <a href="/facts/Polyhedron/UC0p9FTF">polyhedron</a> (a geometric figure) formed by connecting a <a href="/facts/Polygon/xvkmYhvG">polygonal</a> base and a point, called the <a href="/facts/Apex_(geometry)/SrMxmHJk">apex</a>. Each base <a href="/facts/Edge_(geometry)/3lFN6sEz">edge</a> and apex form a <a href="/facts/Triangle/cRXUwsMn">triangle</a>, called a lateral face. A pyramid is a <a href="/facts/Cone/2c9GIzYD">conic solid</a> with a polygonal base. Many types of pyramids can be found by determining the shape of bases, either by based on a <a href="/facts/Regular_polygon/ws89Nhpt">regular polygon</a> (regular pyramids) or by cutting off the apex (truncated pyramid). It can be generalized into higher dimensions, known as <a href="/facts/Hyperpyramid/awcQCnBh">hyperpyramid</a>. All pyramids are <a href="/facts/Self-dual_polyhedron/rkIHbmAf">self-dual</a>. </p>