mutiply by pi
3.14159265.............................................
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You multiply the diameter by Pi, that is 3.14159 (to the nearest 5th decimal). circumf. = dia. x Pi.
In any circle, the ratio of circumference to diameter is (pi).
Circumference = 2*pi*radius or diameter*pi
3.9 x 3.14 m
10/pi = 3.1831 feet (rounded)