You times the radius by 2.
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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!
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
The longest chord in a circle is its diameter and halve of this is its radius.