Mensuration: CBSE class 8 maths.br Euler's relation for three dimensional shapes.br Twenty Proofs of Euler's Formula: V-E+F=2. ... This page lists proofs of the Euler formula: for any convex polyhedron, the number of vertices and faces together is exactly two more than the number of edges. Symbolically V−E+F=2.br Vertices, Edges and face about Cuboid.