## Scaling Circles

The area of circle $$A$$ is $$25\pi$$, and the area of circle $$B$$ is $$4\pi$$. What is ratio of the circumference of circle $$A$$ to the circumference of circle $$B$$.

(A) 2.5 : 1      (B) 5 : 2      (C) 5 : 4    (D) 25 : 16      (E) 125 : 1 Read more ›