circumference of a circle = 2*pi*radius or pi*diameter
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The circumference of a 90 cm circle is: 283 cm
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