The radius is a line segment from the center of the circle to a point on the circle. As a distance, it's half the diameter.
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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.
It is the radius of the circle.
The radius of a circle = the diameter of the circle divided by 2