One circle has a circumference of 12pi cm. Another circle has a circumference of 32pi cm. What is the ratio of the radius of the smaller cir

One circle has a circumference of 12pi cm. Another circle has a circumference of 32pi cm. What is the ratio of the radius of the smaller circle to the radius of the larger circle ?

Diameter D = 32 cm  ->  R ( larger circle ) = 16 cm

diameter  d = 12 cm  ->  r ( smaller circle ) = 6 cm

$$\dfrac{r}{R}=\dfrac{6}{16}=\dfrac{3}{8}=0.375$$

The ratio of the radius of the smaller circle to the radius of the larger circle = 0.375