circum. = pi x diameter :)
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Diameter = Circumference/pi
Circumference = π * Diameter
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Divide the circumference by PI (3,14159...)
If you have only the diameter to get the circumference you have to multiply the circumference by pi: 3.14