Volume of a tetrahedron. A tetrahedron consists of four triangular planes and has a total of four edges. The prefactor is approximately: $$\frac{\sqrt{2}}{12} \approx 0.118$$. For example, if the side length of a tetrahedron is $$a = 1 \, \text{m}$$, then the volume of the tetrahedron is:$$V ~=~ 0.118 \, \cdot \, (1 \, \text{m})^3 ~=~ 0.118 \, \text{m}^3$$