Aptitude - Area - Discussion
Discussion Forum : Area - General Questions (Q.No. 9)
9.
The diagonal of a rectangle is 41 cm and its area is 20 sq. cm. The perimeter of the rectangle must be:
Answer: Option
Explanation:
l2 + b2 = 41.
Also, lb = 20.
(l + b)2 = (l2 + b2) + 2lb = 41 + 40 = 81
(l + b) = 9.
Perimeter = 2(l + b) = 18 cm.
Discussion:
15 comments Page 2 of 2.
Hrishi said:
9 years ago
You explained very well @Vinit Kumar.
(1)
Silmn said:
8 years ago
Why (a + b)^2 formula is used here?
(1)
Abhi said:
1 decade ago
How did you took root of 41 there?
Mmmm said:
1 decade ago
How did you take 40 there ?
Krish said:
1 decade ago
How 81 came?
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