EDIT: To find the diameter, using the circumference - you divide the circumference by the value of Pi - Snakester1962 (Supervisor)
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Diameter = circumference/pi
Circumference = pi*diameter or 2*pi*radius
Divide the circumference by pi, and that will give you the diameter.
Since circumference is found by multiplying pi by the diameter of the circle, the diameter can by found using the inverse operation. diameter = circumference/pi
circumference = π x diameter π = 3.14159...