9 x 3.1416 = 28.27 linear units
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If the diameter of a circle is 9 the circumference is: 28.3
circumference = pi * diameter so, diameter = 9/ pi = 2.86
The circumference of 9 inch diameter circle is about 28.27 inches.
Since the circumference is the diameter times pi, it follows that the diameter is the circumference divided by pi. Pi is approximately 3.1416.
If 9 cm is the diameter, I think the circumference should be 9 times pi centimeters, which is approximately 28.274333882308139146163790449516 centimeters for the circumference. *********************************************** The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle. Thus: 3.14 x 9 = 28.26cm