In the case of a circle:
Diameter: The distance through the circle - from one end to the other, passing through the center.
Circumference: The distance around the circle.
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The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
148
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