Answer :

musiclover10045

The ratio of the circumferences equals the ratio of the radii.

 so we need to find their radii


 first circle's radius:
pir^2 = 6pi
r = √6


 second circle's radius:
pir^2 = 150pi
r = √150


 Their ratio is
√6 : √150 =
√6 : √6√25 =
√6 : 5√6 =
1 : 5

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