The answer will depend on what is meant by "how do you you do" or even "how do you do".
I do not do circumference. A can draw it, I can calculate it, I can calculate other measures (area, radius, diameter) from it but I do not DO it!
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The circumference is: 6*pi/pi = 6 units
The circumference of a circle with radius of 6 is about 37.7
Circumference of circle: 6*pi inches
circumference = 6*pi cm
The circumference of the circle: 6*pi meters