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The diagonal of a rectangle is 41 cm and its area is 20 sq. cm. The perimeter of the rectangle must be:

Correct Answer: 18

Explanation:

l 2 + b 2 = 41  (or)    l 2 + b 2 = 41   


Also,  l b = 20


l + b 2 = l 2 + b 2 + 2 l b   = 41 + 40 = 81


(l + b) = 9. 


Perimeter = 2(l + b) = 18 cm.


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