If the area of a circle decreases by 20%, then the radius of a circle decreases by  Choose the correct answer:
A) 20% B) 18% C) 36% D) 11% E) None of these
If area of a circle decreased by x % then the radius of a circle decreases by   (100−10√100−x)%=(100−10√100−20)%   = (100−10√80)%   = 100 - 89= 
<gadget id="calculator">100 - 89</gadget>
<output>11</output>
11%   Answer 11%
<result>D</result>
If the area of a circle decreases by 20%, then the radius of a circle decreases by