number of edges on a prism
1 Its prism has 2 n vertices, 3 n edges, and 2 + n faces. 2  Take a polyhedron with v vertices, e edges, and f faces. 3  Its prism has 2 v vertices, 2e + v edges, 2f + e faces, and 2 + f cells. 4  Take a polychoron with v vertices, e edges, f faces and c cells.