Product of Number of Edges, Edges per Face and Faces of Tetrahedron

Theorem
The product of the number of edges, edges per face and faces of a tetrahedron is $72$.

Proof
A tetrahedron has:
 * $6$ edges

and:
 * $4$ faces.

Each face is a triangle, and so has $3$ edges.

Hence:
 * $6 \times 4 \times 3 = 72$