I am going to assume you have a cylindrical tank. The base of a cylindical tank is a circle. The circumference of a circle is 2*Pi*r or Pi*d. So, the circumference of your tank would be Pi*12 ~= 37.7'
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The diameter of a circle with a 12-foot circumference is about 3.82 feet. (circumference divided by Pi = diameter).
The circumference of a circle with a diameter of 12 is about: 37.7 (C = diameter x Pi).
Circumference= 37.68 feet. All you have to do is multiply the diameter by pi. Same with radius. Multiply the radius by two to get the diameter then do diameter times pi.(pi= 3.14 or 22 over 7.)
diameter = circumference/pi = 12/3.1416 units = 3.62 units (approx)
The circumference of a circle with a diameter of 12 cm is: about 37.7 cm