if the radius of a circle is diminished by 10 % , then the area is diminished by :
"explanation : let the original radius be r cm . new radius = 2 r area = π r 2 new area = π 2 r 2 = 4 π r 2 increase in area = ( 4 π r 2 − π r 2 ) = 3 π r 2 increase percent = 3 π r 2 / π r 2 ∗ 100 = 300 % option c"
multiply(subtract(divide(const_100, const_100), power(subtract(divide(const_100, const_100), divide(10, const_100)), const_2)), const_100)