
A polyhedron is a 3dimensional shape with sides made of polygons. The simplest polyhedron is the tetrahedron, a four sided figure with each side a triangle. A regular tetrahedron has sides that are equilateral triangles. Polyhedra may be concave or convex. The word polyhedron is from the Greek poly (many) and the IndoEuropean hedron (seat or face).
Each polyhedron contains faces, edges, and vertices. A face of a polyhedron is a polygon, a flat, 2dimensional shape that make up the boundary of the polyhedron. An edge is where 2 faces join. A vertex of a polyhedron is where two or more edges meet. The EulerDescarte polyhedron formula relates the number of faces, edges and vertices of convex polyhedra:V + F  E = 2
In the EulerDescartes formula, V is the
number of vertices, F is the number of
faces, and E is the number of edges.
Polyhedra are named for the number of sides they possess and, sometimes, the shape of the faces. However, there may be than one shape that qualifies for each name. Click on the name in the table to find out more about that class of polyhedra. 
#  A  B  C  D 
E  F  G  H  I 
J  K  L  M  N 
O  P  Q  R  S 
T  U  V  W  X 
Y  Z 
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