1.

The length and breadth of a rectangle are in the ratio 9 : 5. If its area is 720 m2 , find its perimeter. (a) 112 metre (b) 115 metre (c) 110 metre (d) 118 metre (e) None of these

Answer»

(a) Let the length and breadth of a rectangle are 9 x and  5x respectively.

 In a rectangle, area = length × breadth

720 = 9x × 5x 

or x2 = 16  

x = 4 

Thus, length = 9 × 4 = 36 m

 and breadth = 5 × 4 = 20 m 

Therefore, perimeter of rectangle = 2(36 + 20) = 112 m



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