Divide the circumference by the value of Pi and divide the result by 2 - that will give you your answer.
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The circumference of a circle with a radius of four is: 25.13
A circle with a radius of 4m has a circumference of 25.133m.
The circumference of a circle that has a radius of 3.2cm is: 20.1cm
It will have a radius of 2 because 2*pi*radius is the circumference of the circle.
The circumference of a circle with radius of 10cm is: 62.83 cm