9*pi or 2*pi*4.5
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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)
56.548667764616276 circumference = PI * diameter
If a circle has a circumference of 9, the diameter is: 2.864
Diameter of circle: 9/pi = 2.865 feet rounded to 3 d.p.