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Measure the diameter. Multiply the diameter by Pi, this will give the circumference. Pi is approximately 3.1415927 You can use the Pi symbol on a scientific calculator or use 22/7.
Bob tried to find the diameter of the circle.
In a circle, the radius is half of the diameter.
you double the radius to find the diameter.
When dealing with pipe the volume is more important, therefore, I would use the inside diameter.