The circumference of any circle = 2*pi*radius or diameter*pi which in this case would be in cm
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If the circumference of a circle is 12 cm the radius is: 1.91 cm
A circle with a radius of 9.3 cm has a circumference of 58.43 cm
A circle with a radius of 0.5 cm has a circumference of 3.14 cm.
A circle with a radius of 7.7 cm has a circumference of 48.38 cm
A circle with a radius of 208 cm has a circumference of 1306.9 cm