Question

if the ratio of the diameter of two circles is5: what is the ration of their circumferences

Answer 1

   
$\displaystyle \\ \frac{D_1}{D_2}=5 \\ \\ \\ \frac{\text{Circumference 1}}{\text{Circumference 2}} = \frac{\pi D_1}{\pi D_1} =\frac{D_1}{D_2}=\boxed{5}$