A circumference of 9.42 feet.
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A circle with a diameter of three feet has a circumference of 9.4 feet.
The ratio between the diameter of a circle and its circumference is constant: π. A circle whose circumference measures 3 feet has a diameter of 3/π feet: approximately 11.459 inches.
A circle with a radius of 3 feet has a circumference of 18.85 feet.
Diameter of circle: 9/pi = 2.865 feet rounded to 3 d.p.
The circumference of a circle with a diameter of 3 meters is: 9.42 meters (diameter x Pi = circumference).