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
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The circumference is equal to pi ( 3.14167... ) times the diameter. You do the math.
circumference = 2*pi*radius or pi*diameter
Circumference = 2 * Pi * radius Radius = 23 / (2 * Pi) Radius = 3.66 inches
It is: 12/pi = 3.8197 inches rounded to 4 decimal places
Circumference = 2*pi*rr(radius) = diameter/2 = 36 in/2 = 18 inchesCircumference = 2*pi(18 inches)= 113 inches=========