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Question

The ratio of the radii of two circles is 3 : 2. What is the ratio of their circumference?

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Solution

Circumference of a circle = 2πr
where r is the radius of the circle

Let r1 and r2 are radii of two circles respectively.

r1r2=3:2 (Given)

Now, the ratio of their circumference
= 2πr12πr2=r1r2=3:2

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