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A circumference of 37.7 centimeters.
The circumference of a circle with a diameter of 6 centimeters is 18.85 centimeters.
The circumference of a circle with a diameter of 20 centimeters is: 62.83 cm (diameter x Pi = circumference).
The circumference of a circle with diameter of 30 centimeters is: 94.2 cm (diameter x Pi = circumference).
The circumference of a circle with a diameter of 16 centimeters is 50.27 cm