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You would multiply the radius by two then multiply by pi which would be 3.14.

Here would be the formula:

C=pi2r

C=circumference

pi=3.14 when you round

r=radius

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Q: How do you find the circumference if you are given the raidus?
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How do you find raidus of earth?

Divide the circumference of the earth by (2x3.14) and that's roughly the answer.


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circumference is diameter times 3.14 diameter is raidus times 2 1 times 2 equals 2 3.14 times 2 equals 6.28 circimference is6.28


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Divide the circumference by pi (3.141592......) to get the diameter.


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