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The radius is the circumference divided by 2 x pi.

C= pi(2r)

R=C/2pi

Divide the circumference by Pi (about 3.1416). This gives you the diameter. Now divide the diameter by two to get the radius.

Divide the circumference by pi divided by 2
Visit the website in the related link. The formula (any algebraic expression) for the different parts of the circle are on there, and it explains it very well.

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Q: How do you find the radius of a circle when given the circumference?
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