Circumference of a Circle

The circumference of a circle can be calculated using the following formula:

C is circumference and r is radius. Both 2 and π are constants, so the formula can be simplified to the following:

The radius of the circle can be solved with a known circumference by rearranging the formula. The following is the formula for calculating a circle’s radius with a known circumference.

radius of a circle with known circumference formula

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