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A circle with a radius of 9.6 millimeters has a circumference of 60.32 millimeters.
The circumference of a circle with a radius of 175 millimeters is about 1,100 mm (C = r x 2 x Pi).
The circumference of a circle if the radius is 12 equals about 75.4
If the circumference of a circle is 12 cm the radius is: 1.91 cm
A circle with a radius of two inches has a circumference of about 319.28 mm.To the same accuracy as the one significant figure in the question: 300 mmTo a whole number of millimeters: 319