Question

The perimeter of a floor of a room is 30 in and its height is 3 m. Find the area of four walls of the room.

Answer 1

Perimeter of floor = 30 m
i.e. 2(l+b) = 30 m
Height = 3 m
$\therefore$ Area of four walls = Perimeter $\times height$
= $30\times 3=90m^2$