The perimeter of a floor of a room is 30 m and its height is 3 m. Find the area of four walls of the room.
Given details are,
Height of floor = 3m
Perimeter of floor = 30m
So, perimeter = 30
2(l+b) = 30
l+b = 30/2
l+b = 15m
∴ Area of four walls of room = 2 (lh + bh) m2
= 2h (l+b)
= 2 (3) (15)
= 90m2
