If a pipe is 12 inches aroud, then that is its circumference. The width is the diameter. To get the diameter, you'll have to divide 12 by pi, or 3.14, and the answer you get is 12/3.14=3.82.
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An 8-inch pipe that is 16,800 feet long has a volume of: 5,860 cubic feet (43,835.8 liquid gallons).
4 inches
12*sqrt(2) ----
The total width of the triptych being 45 inches, each of the thre panels has a width of 15 inches.
The imperial system - so called because of its wide-spread use across the British Empire.