tetrahedron A polyhedron of four faces is called a tetrahedron

hexahedron A polyhedron of six faces is called a hexahedron.

octahedron A polyhedron of eight faces is called an octahedron.

dodecahedronA polyhedron of 12 faces is called a dodecahedron.

icosahedronA polyhedron of 20 faces is called an icosahedron.

Euler's Theorem


If the number of edges of a polyhedron is denoted by E,
the number of vertices by V,
and the number of faces by F,
then E+2=V+F.