The ratio of the radius of two circles is 3: 4, and then the ratio of their areas is?	Pick one:	A) 1 : 7	B) 9 : 16	C) 1 : 9	D) 3 : 7	E) 3 : 4

Rationale: "r 1 : r 2 = 3 : 4 î r 1 ^ 2 : î r 2 ^ 2 r 1 ^ 2 : r 2 ^ 2 = 9 : 16 answer : b"
Answer: B