Dual polyhedron

In geometry, polyhedra are associated into pairs called duals, where the vertices of one correspond to the faces of the other

The dual of the dual is the original polyhedron

The dual of a polyhedron with equivalent vertices is one with equivalent faces, and of one with equivalent edges is another with equivalent edges

Cube and its dual Octahedron 正方體與其對偶正八面體

Dodecahedron and its dual Icosahedron 正十二面體與其對偶正二十面體

Tetrahedron and its dual Tetrahedron 正四面體為本身對偶