Question

The ratio of radii of the two circle is 5:9. What is the ratio of their circumferences?

Answer 1

here is the solution.

Answer 2

Answer:

circumfrencees of a circle = 2πr

let there be a circle c1 having radius r1 and let there be a circle c2 having radius r2

if the ratio of their ratio is 5:9 r1/r2 = 5/9

the ratio of their circumferences = 2πr1/2π2 = r1/ r2 = 5/9= 5:9 is the answer