A circle with a radius (d/2) of 15 cm has a circumference of 94.2 cm
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The circumference of a circle with diameter of 30 centimeters is: 94.2 cm (diameter x Pi = circumference).
pi*30 cm
30/pi cm
Diameter in cm = circumference/pi
A circle with a radius of 9.3 cm has a circumference of 58.43 cm