Ratio,Proportion, Percentages and Discounting Q.17
0. The radius of a circle has increased by 20%. By what percentage does its area increase?
- Option : B
- Explanation : Area of a circle= πr2
As r2 = r × r and as r increases by 20%, r2 increases by 20 + 20 + ( 20 x 20/100)=44%
