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The equation for circumfrance is 2(pi)r (pi meaning the constant 3.14159, rounded). To find the radius if the circumfrance is known, you would re-arrange this equation to solve for r - it would go from C=2(pi)r into r=C/2(pi).

c = circumference, r = radius.

If the circumference is 2*pi*r, then r = c/(2*pi)=

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Q: How do you find the radius using the circumference?
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