if the area of a circle decreases by 36 % , then the radius of a circle decreases by
"if area of a circle decreased by x % then the radius of a circle decreases by ( 100 − 10 √ 100 − x ) % = ( 100 − 10 √ 100 − 36 ) % = ( 100 − 10 √ 64 ) % = 100 - 80 = 20 % answer a"
multiply(subtract(const_1, sqrt(divide(subtract(const_100, 36), const_100))), const_100)