if the radius of a circle is increased by 12 % , then the area of the circle
a 1 = pi ( 100 ) ^ 2 a 2 = pi ( 112 ) ^ 2 so ( a 2 - a 1 ) / a 1 * 100 = 25.44 answer : b
multiply(subtract(power(add(divide(12, const_100), const_1), const_2), const_1), const_100)