The length and breadth of a rectangle are in the ratio 5:4. Find its perimeter if its area is 180 cm²

Ratio and Proportion 13/12/2020

A. 54 cm
B. 27 cm
C. 12 cm
D. 15 cm

Let the length and breadth be 5x cm and 4x cm.
5x*4x=180
20x²=180
x²=9,x=3 Length = 15cm Breadth = 12cm Perimeter
= 2(l+b)
= 2*27
= 54 cm

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