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Circumference = pi*d, so Circumference = 16*pi
A circle 16 meters in diameter has a circumference of 16*pi or about 50.26 meters.
diameter = circumference/pi.
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