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remember the formula for circumference -> pi x d where pi is our favorite number in math i.e. 3.14159.... and d is the diameter. So your answer would be

3.14159 x 31 = 97.39 (rounded to decimal places) but your 31 should also have a unit of length with it.

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Q: What is the circumference of 31 diameter?
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Related questions

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Circumference = Diameter*pi So diameter = Circumference/pi = 32*pi/31 = 32


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