If a circle has a radius of 1, the diameter is 2, and the circumference is 6.28 (approximately).
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The circumference of circle with radius 12cm is 75.4cm
The radius of a circle with a circumference of 110 is: 17.507
The circumference of a circle with a radius of 6.7 is: 42.097
The circumference of a circle if its radius is 3 is about 18.85
Radius of a circle = circumference/2*pi