Lateral area of a frustum of a regular pyramid
$$S_{son} = \frac{1}{2}\cdot (P1+P2)\cdot h_{s}$$
S_lat - lateral area
P1, P2 - perimeters of lower and upper bases
h_s - apothem (slant height)
P1, P2 - perimeters of lower and upper bases
h_s - apothem (slant height)
Find
It is known that:
= 