If the diameter of circle R is 40% of the diameter of circle S, the area of circle R is what percent of the area of circle S? Choose the most appropriate option.
A) 16%
B) 18%
C) 20%
D) 22%
E) 24%
Let diameter of circle R , dr = 40   and diameter of circle S , ds = 100   Radius of circle R , Rr = 20   Radius of circle S , Rs = 50   16%rea of circle R/ 16%rea of circle S = (pi * Rr ^2 ) /( pi * Rs^2 )   = (20/50)^2 = (4/10)^2   =16%   16%nswer :16%
<result>A</result>
If the diameter of circle R is 40% of the diameter of circle S, the area of circle R is what percent of the area of circle S?