As for example when constructing a round-about on a road you'll need to know its perimeter which is the circumference of a circle.
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circumference of a circle = 2piradiuis or diameter*pi
So that you can find the circumference of a circle.
The circumference of a circle would be needed as for example when constructing a circular swimming pool.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.
You need to know diameter of each circle, which are different for each circle; each circle circumference is pi x diameter where pi = 3.14159