Circumference is 2piR where R is the radius. Radius is 1/2 diameter so R = 8. Therefore circumference is 2x8xpi which is 16pi or 50.265
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The circumference of a circle with a diameter of 16 centimeters is 50.27 cm
The circumference of a circle that is 16 mm in diameter is 50.27 mm
diameter = circumference/pi.
The diameter is about 5.1'
A circle 16 meters in diameter has a circumference of 16*pi or about 50.26 meters.