the ratio of the radius of two circles is 3 : 4 , and then the ratio of their areas is ?
"r 1 : r 2 = 3 : 4 î r 1 ^ 2 : î r 2 ^ 2 r 1 ^ 2 : r 2 ^ 2 = 9 : 16 answer : b"
divide(circle_area(3), circle_area(4))