if the diameter of circle r is 50 % of the diameter of circle s , the area of circle r is what percent of the area of circle s ?
"let diameter of circle r , dr = 50 and diameter of circle s , ds = 100 radius of circle r , rr = 25 radius of circle s , rs = 50 area of circle r / area of circle s = ( pi * rr ^ 2 ) / ( pi * rs ^ 2 ) = ( 25 / 50 ) ^ 2 = ( 5 / 10 ) ^ 2 = 25 % answer : b"
divide(multiply(circle_area(50), const_100), circle_area(const_100))