It depends on the information that you do have. If you know the diameter, the circumference or the area the equations are relatively straightforward.
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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
to find the radius you have to measer trow the circle then divid by 2
Circumference=2*pi*radius
The formula to find area is you do the radius squared times pi or 3.14