The radical axis of two circles is the locus of all those points frm which two equal tangents can be drawn to the circles.
Few points about it
* The radical axis is always a straight line perpendicular to the line through the centers of the circles.
* If the circles intersect, the radical axis is the line passing through the intersection points,
* if the circles are touching each other, the radical axis is simply the common tangent
Thr is one radical axis theorem, which states that the radical axes of three circles (no two of which are concentric) are concurrent (share a common point) or parallel (in this case, they concur at the point of infinity).
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