To get circumference, you have to use a simple equation.
Circumference = pi x diameter
You also need to know what pi equals. Rounded, it equals 3.14. Now you just need to know the diameter. The diameter is the distance across a circle. It is usually measured in centimeters.
C = 3.14 x 6cm
Then you would multiply them and get the circumference of that circle.
C = 18.84
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