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Best Answer

C = D x pi = 2 x R x pi

C = circumference

D = diameter

R = radius

pi = 3.141 592 653 ... (a mathematical constant)

Example:

Let

R = 10 inches

Then

C = 2 x 10 inches x 3.14 = 62.8 inches

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Q: What is the circumference of a circle if the radius is 10 inches?
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The circumference of a circle with a radius of 10 inches is about 62.83 inches.


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