Since the circumference is the diameter times pi, it follows that the diameter is the circumference divided by pi. Pi is approximately 3.1416.
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The circumference of 9 inch diameter circle is about 28.27 inches.
If the diameter of a circle is 9 the circumference is: 28.3
The area of a circle with a diameter of 9 inches is: 63.62 square inches.
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
Circumference of a circle is: 2*pi*radius or pi*diameter