It is: 12/pi = 3.8197 inches rounded to 4 decimal places
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The circumference of 12-inch pipe is: 37.7 inches. (C = d x Pi)Since 12 inch pipe is a nominal size and its outside diameter is 12.75 inches, the circumference of 12 inch pipe actually is : 40.035 inches
diameter = circumference/pi = 12/pi inches
12 inch diameter(also 6 inch radius).
The circumference of a circle with a diameter of 12 is about: 37.7 (C = diameter x Pi).
diameter = circumference/pi = 12/3.1416 units = 3.62 units (approx)