The ratio of the radius of two circles is 2: 7, and then the ratio of their areas is?
Choose the correct choice from the following:
A) 1 : 7
B) 2 : 9
C) 1 : 9
D) 4 : 49
E) 3 : 4

Rationale: "r 1 : r 2 = 2 : 7 î r 1 ^ 2 : î r 2 ^ 2 r 1 ^ 2 : r 2 ^ 2 = 4 : 49 answer : d"
Answer: D