If the radius of a circle is diminished by 10%, then the area is diminished by: Choose the correct choice
A) 200%
B) 210%
C) 300%
D) 310%
E) None of these
Explanation:   Let the original radius be R cm. New radius = 2R   Area=πR2   New Area =π2R2   =4πR2   Increase in area =(4πR2−πR2)=3πR2   Increase percent =3πR2 /πR2∗100=300%   Option 300%
<result>C</result>
If the radius of a circle is diminished by 10%, then the area is diminished by: