diameter*pi = circumference
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Circumference of a circle: pi times diameter
You multiply the diameter by Pi (about 3.1416) to get the circumference.
Multiply the diameter by pi to find the circle's circumference
To get the circumference of a circle first you have to find the diameter of the circle and multiply the diameter by Pi (3.14 in short). so it is the diameter * Pi.
Find the diameter, then multiply that by Pi (about 3.1416). The result is the circle's circumference.