To find this, you have to use the formula: D= C/Pie
SO...
D= C/Pie
D= 29.83/3.14
D= 9.5 (You didn't tell me units so i can put units next to it)
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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).