The radius of this circle is 10 units.
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Divide the circumference by (2 x pi).
Just divide the circumference by (2 x pi). Pi is about 3.1416.
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared
Radius of a circle = circumference/2*pi
circumference= pi(3.14) by the diameter. if your given the radius, double the radius and times by pi.