To solve a circumference question, one must use the furmula C=2πr where C is circumference, π is approx. 3.14159, and r is the radius or the formula C=πd, where d is diameter.For this equation I would naturally use C=πd so: C= 28.27
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Diameter of circle: 9/pi = 2.865 feet rounded to 3 d.p.
If a circle has a circumference of 9, the diameter is: 2.864
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)
The circumference of a circle is equal to Pi x diameter. So, 9 x 3.1416 = about 28.274 units.