2 pi r
this is the equation of the circumference of a circle. just multiply out 2 times pi(3.14159) times the radius that you were given.
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Divide the circumference by 2PI to find the radius. ( C = 2PI*Radius)
Diameter = circumference/pi Radius = circumference/2*pi
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
Radius = square root of (area/pi) Circumference = 2*pi*radius