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Q.
The diagonal of a rectangle is sqrt(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
View Answer
Correct choice: B
Explanation:
l2+b2 = (diagonal)2=40 Also, lb=20 (l+b)2=l2+b2+2lb = 41 + 40 =81 (l + b) = 9. Perimeter = 2(l + b) = 18 cm.
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