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The radius is 5 cm.
If the circumference of a circle is 12 cm the radius is: 1.91 cm
The length of the diameter will be 30 cm if the radius is 15 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