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The circumference of a circle is the Diameter multiplied by Pi, or in mathematical notation:

* C=πD (Circumference = the quantity of Pi multiplied by the Diameter) OR

* C=2πr (Circumference = the quantity of 2 multiplied by Pi multiplied by the Radius)

The radius of a circle with a circumference of 5 inches can be found as follows:

C=2πr

5 inches=2πr

5 inches/(2π)=r

~0.7958 inches=r

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โˆ™ 2009-03-24 05:36:36
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Q: How do you the radius of a circle if the circumference is 5 inches?
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