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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?

 Jun 9, 2015

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 #1
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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

 

 Jun 10, 2015
 #1
avatar+26367 
+5
Best Answer

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

 

heureka Jun 10, 2015

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