if the radius of a circle is increased by 30 % then the area is increased by :
"initially a = pi * r 2 now r 2 = 130 / 100 r then area = pi * ( 130 r / 100 ) 2 area = 169 r / 100 that is area increases from 100 to 169 = increase in area = 69 % answer : b"
multiply(subtract(divide(const_100, const_100), power(subtract(divide(const_100, const_100), divide(30, const_100)), const_2)), const_100)