In a circle its radius is half the size of its diameter.
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The radius is half the diameter of a circle.
The relationship is that the radius is half of circle's diameter.
Pi and the radius can be used to find the area (PiR^2) or the circumference (2RPi) of a circle, where R is the radius.
If the figure is truly a circle, then the circumference is (Radius) x (2 pi) .
The radius is half the diameter.