The radical axis of two circles is the line containing all points P such that the lengths of the tangents from P to the two circles are equal. Each figure shows a point P on the radical axis and tangents touching the two circles at T1 and T2, with PT1 = PT2. If the circles intersect in two points, as in the second figure, the radical axis is the straight line through the two points of intersection.
Radical axis of disjoint circles
Radical axis of intersecting circles
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- Bevan, Aneurin (1897–1960)
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