Square pyramid

In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, a square pyramid is a <a href="/facts/Pyramid_(geometry)/fCXRgFwu">pyramid</a> with a square base and four triangles, having a total of five faces. If the <a href="/facts/Apex_(geometry)/SrMxmHJk">apex</a> of the pyramid is directly above the center of the square, it is a right square pyramid with four <a href="/facts/Isosceles_triangle/rvLe3yqK">isosceles triangles</a>; otherwise, it is an oblique square pyramid. When all of the pyramid's edges are equal in length, its triangles are all <a href="/facts/Equilateral_triangle/MJomsYDS">equilateral</a>. It is called an equilateral square pyramid, an example of a <a href="/facts/Johnson_solid/8SR7CyNz">Johnson solid</a>.
Square pyramids have appeared throughout the history of architecture, with examples being <a href="/facts/Egyptian_pyramid/gad114LI">Egyptian pyramids</a> and many other similar buildings. They also occur in chemistry in <a href="/facts/Square_pyramidal_molecular_geometry/dQDl1IpI">square pyramidal molecular structures</a>. Square pyramids are often used in the construction of other <a href="/facts/Polyhedra/UC0p9FTF">polyhedra</a>. Many mathematicians in ancient times discovered the formula for the volume of a square pyramid with different approaches.

Square pyramid open-in-new

Square pyramid