well, the radius is half of the diameter, so if i were you id divide by two
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The radius of a circle is half of the diameter! So, if the diameter was four inches, the radius would be two inches!
You times the radius by 2.
Divide the diameter by 2.
Diameter of a circle = 2*radius Circumference of a circle = 2*radius*pi
you cant: pi is the same for any circle - 3.1415... the diamter or the radius has to be given diameter divided by two equals the radius the radius times two equals the diameter