to find the radius you have to measer trow the circle then divid by 2
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The formula is 2pie(radius).
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
Circumference=2*pi*radius
The formula to find area is you do the radius squared times pi or 3.14
There is a specific formula for finding the radius of a curvature, used often when one is measuring a mirror. The formula is: Radius of curvature = R =2*focal length.