circumference = 2*pi*radius or pi*diameter
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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
It is: 12/pi = 3.8197 inches rounded to 4 decimal places
Assuming the 80 inch is the outside measurement and not the internal bore size. Formula is Circumference = radius squared timed by pi (3.1416) 40 × 40 × 3.1416 = 5026.56 inches
The circumference of a 6-inch circle is: 18.85 inches.
The circumference of a 10 inch circle is: 31.416 inches(circumference = diameter x pi).