A radius is half of the diameter of a circle, or the distance from one endpoint to the center.
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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