Twice the radius times pi
or the diameter times pi
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Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
The value of pi = circumference/diameter
Circumference of a circle = diameter*pi Diameter of a circle = circumference/pi
Work it out the circumfrance of a circle is pie x the diameter!
The perimeter of a circle is its circumference