DAPZOI
Home Ask MCQ Quiz Contact Us Login

Prateek Asked :

13-01-2022 Area

Q. The diagonal of a rectangle is root(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


Submit Your Answer

* You must be logged in to add answer.



Dapzoi Verified
Commented on 2022-01-15 11:25:19 (IST)
Answer: Option B

 

Explanation:

root (l^2 + b^2) = root(41) 

Also, lb = 20.

(l + b)^2 = (l^2 + b^2) + 2lb = 41 + 40 = 81

(l + b) = 9.

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