Leonhard Euler has defined the relation between the number of faces, number of edges and number of vertices for various 3-dimensional figures is called as Euler's formula. This formula works with shapes called Polyhedron. A Polyhedron is a closed solid shape which has flat faces and straight edges like cube.

According to him

F + V – E = 2

Where F denotes the number of face

V denotes the number of vertices

E denotes the number of edges.