Take the diameter times pi and you get the circumference.
It's 9.4248.
3 pi is 9.4248 units
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The circumference of a circle with a diameter of 3 meters is: 9.42 meters (diameter x Pi = circumference).
The diameter of a circle with a 3-meter circumference is: 0.9549 meters.
Circumference of a circle = 2*pi*radius or diameter*pi Its diameter = circumference/pi
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.