The circumference of a circle can be found using the equation c=2πr.
For example, if a circle has a radius of 10, its circumference is 20π, or 62.832.
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constant circumfrence circuit cycle coset
Circumfrence=Pi x Diamter=Pi x 2Radius
Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.
Circumfrence=diameter X 3.14 (diameter=2 X radius)
You multiply the diameter by pi, (Approximately 3.14159), so C=pi D.