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| Math Central | Quandaries & Queries |
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Question from Justin, a student: Find the radius of a circle with a circumference of 9.43cm. |
Justin,
The circumference C of a circle is given by C = 2 π r where r is the radius. Thus for your circle
9.43 = 2 π r.
To find r divide both sides by 2 π.
Penny
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