It is the centre of the circle. The size of the radius makes no difference.
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Its the distance from the center of the circle to the edge of the circle.
The standard equation of a circle, with center in (a,b) and radius r, is: (x-a)2 + (y-b)2 = r2
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
x2 + y2 = r2, where r is the radius.
the radius of a circle is r