10/pi = 3.1831 feet (rounded)
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pi times diameter. so about 3.14 times 9 feet= about 28.26
In any circle, the ratio of circumference to diameter is (pi).
mutiply by pi 3.14159265.............................................
Diameter = 10/pi = 3.183098862 feet
Circumference = 2*pi*radius or diameter*pi