The ratio of the radius of two circles is 5: 3, and then the ratio of their areas is?  Choose the correct choice from the following answers:  A) 1: 8  B) 1: 6  C) 25: 9  D) 1: 3  E) 1: 2
r1: r2 = 5: 3   Πr12: Πr22   r12: r22 = 25: 9   Answer:25: 9
<result>C</result>
The ratio of the radius of two circles is 5: 3, and then the ratio of their areas is?