C=2Pir, since r is 8. the answer would be 16pi.
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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
Circumference = pi * diameter so in this case....... Diameter = Circumference/pi D = 16 feet/pi = 5.09 feet
The diameter is about 5.1'