The circumference of a circle divided by its diameter is equal to the value of pi
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Divide the circumference by pi (about 3.1416). The result is the circle's diameter.
Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
Divide the circumference by pi, and that will give you the diameter.
Divide the circumference by pi.
The diameter of a circle with a circumference of 12 is: about 3.82To to this calculation for other circles, just divide the circumference by Pi (about 3.1416). The result is the diameter.