Question

A cuboid has total surface area of 40 m${}^2$ and its lateral surface area is 26 m${}^2$. Find the area of its base.

Answer 1

Total surface area = 2( Surface area of base ) + (Surface area of 4 walls)

$40=2\left(S\right)+26$

$2S=14$

$S=7$ $m^2$

Hence, surface area of base is $7$ $m^2$.