Measure the diameter.
Multiply the diameter by Pi, this will give the circumference.
Pi is approximately 3.1415927
You can use the Pi symbol on a scientific calculator or use 22/7.
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The perimeter of a circle is its circumference
The round perimeter of circle is its circumference
The perimeter of a circle is its circumference
The distance around a circle is its circumference
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.