Diametre x Pi (3.14)
Thus: 3 x 3.14 = 9.42ft
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A circle with a diameter of three feet has a circumference of 9.4 feet.
If its diameter is 43 ft then its circumference is pi*43 = 135.088 ft to 3 dp
circumference = pi*23 = 72.257 ft rounded to 3 decimal places.
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.