Assuming you can't get inside to measure across the silo:
-- Take a long tape measure or non-stretching twine.
-- Measure the distance around the silo (the circumference).
-- Divide the circumference by 'pi' ... 3.142 (rounded).
The answer is the diameter, within 0.02 percent.
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That depends entirely on the diameter !
3.14 * 3.52 *12= 461.58m3Volume=pi * r^2 * hr=.5d 7 * .5 = 3.5h=12
On a farm.
you double the radius to find the diameter.
diameter = circumference/pi