56.549
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If radius of a circle is 9 centimeters the circumference would be: 56.55 cm (r x 2 x Pi = circumference).
The circumference is about 56.55 yards.
Circumference of a circle is: 2*pi*radius or pi*diameter
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