b: The length of the base of the triangular base of the pyramid
H: The height of the triangular base of the pyramid
h: The height of the pyramid
V: The volume of the interior of the pyramid

In general, the volume of a pyramid is one-third the volume of a corresponding prism (with a base congruent to that of the pyramid and a height equal in measure to that of the pyramid).
As a result, the volume of a pyramid is one-third the area of the base times the height of the pyramid.

The area of the triangular base is given by the formula below:

Substitute to get the following:

Simplify to get the result below:
