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Calculating the Circumference of a Circle


The circumference of a circle is the distance around the outside of the circle. It could be called the perimeter of the circle.

How to find the Circumference of a Circle


The circumference of a circle can be found by multiplying pi (which is equal to 3.14) by the diameter of the circle. If a circle has a diameter of 4, its circumference is 3.14*4=12.56 If you know the radius, the diameter is twice as large.