Volume of frustum of a pyramid
$$V = \frac{1}{3}\cdot h\cdot (S1+S2+\sqrt {S1\cdot S2})$$
V - volume
h - height of frustum of a pyramid
S1, S2 - areas of lower and upper bases
h - height of frustum of a pyramid
S1, S2 - areas of lower and upper bases
Find
It is known that:
= 