Diameter is not a unit of length and so the only appropriate answer is, perhaps, "As long as the piece of string!"
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312 inches = 26 feet.
It is: 312*36 = 11,232 inches
312/12 = 26 feet
l= .5 in d= .312 in dxdx .7854 x .5 = .0382269 cubic inches or .0000221 cubic feet multiplied by the known weight of lead (712 lbs/cubic foot) .0157352 pound lead cylinder
The inches in a diameter = 2 X inches in the radius. Or, inches in a diameter = inches in circumference / pi