The area of four walls of a room is 144 cm2. If the length and breadth of the room were equal and the height of the room is 4 cm, then what is the area of the floor?
According to question, => l = b Area of the wall = 2(l + b)h => 144 = 2(l + l) × 4 => 144 = 4 × l × 4 => l = 144/16 = 9 cm Area of the floor = l × b = 9 × 9 = 81 cm2
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