The radius is the distance from the center to the outside edge of the circle. It is also half of the diameter. How you find it depends on what information you have.
c = pi(r^2) so r = sqrt(c/pi)
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the radius of a circle is r
The radius of a circle is half the circle's diameter
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
The radius of a circle = the diameter of the circle divided by 2
It is the radius of the circle.