Question
The perimeter of a rectangle is 54 cm. The ratio of its
length to breadth is 4 : 5. What is the area of the rectangle?Solution
ATQ, Let length = 4k, breadth = 5k Perimeter = 2(l + b) = 2(4k + 5k) = 18k = 54 ⇒ k = 3 Length = 12 cm, breadth = 15 cm Area = 12 × 15 = 180 cm²
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