(9 pi) inches is.
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If a circle has a circumference of 9, the diameter is: 2.864
(pie)(diameter)=(circumference) (pie)(9)(2)=18(pie)=56.549
A circle with a diameter of 9 feet has a circumference of about: 28.27 feet (diameter x Pi = circumference).
Circumference of any circle = (pi) x (diameter) Circumference of this circle = (pi) x (9 feet)
Circumference of 9 inches: 2.864788975654119in. (for pi I used 3.14159265358979) Diameter of 9 inches: 4.5in.