A 12 foot string shaped into a circle would be the circumference.
2*pi*r = 12
d*pi=12
d=12/pi=3.8 something
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The volume is 150.8 cubic feet.
Since radius is half of a diameter, therefore 12 x 2 = 24
pi*12*12*1760*3 = 2,388,615.726 cubic feet.
The volume of an cylinder of 8 feet long and 3 feet in diameter is: 56.5 cubic feet.
V = 452.39 cubic feet.