Question

The diameter of circle A is 3 times the diameter of circle B. What is the ratio of the radius of circle A to the radius of circle B?

Answer 1

Given that, `d_A=3*d_B`.

But, `d_A=2*r_A, and, d_B=2*r_B`.

`:. 2r_A=3(2*r_B)=6r_B rArr r_A : r_B=6:2=3:1`.