Here are three:
If you have the area - radius = sqrt( A/Pi )
If you have the diameter - radius = D/2
If you have the circumference - radius = (C/(2Pi))
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The formula is 2pie(radius).
radius = 1/2 diameter
3.14 times the radius times 2
To find the circumference of a circle the formula is: 2*pi*radius or diameter*pi
what is the radius? It depends on the the radius. Formula 3.14*radius squared*5=answer