The circumference of a circle that is 9 cm wide is: 28.274 cm
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C=2*pi*r C=2*pi*9 C=18pi C=18*3.141592=56.548656...
Diameter of a circle = circumference/pi
A circle with a circumference of 11.25 has a diameter of: 3.581
The circumference of a circle with a radius of four is: 25.13
The circumference of 5 foot circle is: 15.7