C = 2πr
C = 2π * 4.5
C = 9π or 28.2743 feet.
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Diameter of circle: 9/pi = 2.865 feet rounded to 3 d.p.
The circumference of a 128-foot diameter circle is: 402.12 feet.
The circumference of a six-foot diameter circle is: 18.85 feet.
The circumference of a 4 foot circle is: 12.57 feet(diameter x pi = circumference).
If a circle has a circumference of 9, the diameter is: 2.864