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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31 feet 5 inches
Circumference is Pi x Diameter so do Circumference divided by Pi to get the diameter :)
diameter = circumference/pi
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
Yes because: circumference/diameter = pi and circumference = pi*diameter