if radius of a circle is diminished by 10 % then its area is diminished by
explanation : let old radius = 10 units . new radius is diminshed by 10 % . so new radius = 90 % ( 10 ) = 9 units . old area = π × r 2 = 100 π new area = π × 92 = 81 π change = 19 π / 100 π × 100 = 19 % answer : b
multiply(divide(subtract(circle_area(const_1), circle_area(subtract(const_1, divide(10, const_100)))), circle_area(const_1)), const_100)