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The circumference of any circle is: diameter times pi The circumference of any circle divided by its diameter is the value of pi
The circumference for any circle = pi * diameter.
For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.
Diameter of any circle = circumference/pi
Circumference of any circle = (pi) x (diameter) Circumference of this circle = (pi) x (9 feet)