The circumference of a circle is worked out by multiplying the diameter of the circle by pi.
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diameter*pi = circumference
To estimate the circumference, multiply the diameter by 3. If you have a calculator or are decent at multiplication and have the time, multiply it by 3.14. If you can, multiply it by pi.
The circumference also doubles.
8pi, the circumference is 2pi multiply by radius
you can multiply the diameter by pie to find the circumference