Assuming 9m refers to the radius, the diameter is 18 m and the circumference is 56.5 m
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The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
The circumference of a circle with a diameter of 55 mm is: 172.8 mm
pi = 21.99/7 pi = circumference/diameter Just multiply your diameter by pi to get a circumference.
Diameter = Circumference / Pi Diameter = 16 / 3.14 Diameter = 5.095
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).