diameter = circumference/pi
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Diameter of circle: 12/pi = 3.8197 meters to four decimal places
diameter = 50/pi
The circumference of a 9.5-meter diameter circle is: 29.85 meters. (C = d x Pi)
A circle with a diameter of one meter has an area of 0.785 square meters.
The circumference of a circle with a diameter of 50 feet is about 157.1 feet. (diameter x Pi = circumference).