to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
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how do you calculate the circunference of hemisphere?
pi times diameter = circumference
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!
Circumference = diameter*pi
Circumference = 2*pi*radius