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Q: The diagonal of a rectangle is √41 cm and its area is 20 sq cm. The perimeter of the rectangle must be
A. 9 cm B. 18 cm
C. 20 cm D. 41 cm

Answer and Explanation

Answer:18 cm

Explanation:
√(l2 + b2) = √41 or l2 + b2 = 41, Also lb = 20
(l + b)2 = (l2 + b2) + 2lb = 41 + 40 = (l + b) = 9
Hence, Perimeter = 2 (l + b) = 18 cm

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