axis, if
: If the circles have two points in common, the radical axis is the common secant line of the circles.
If point is outside the circles, has equal tangential distance to the both circles.
If the radii are equal, the radical axis is the line segment bisector of .
In any case the radical axis is a line perpendicular to

On notations

The term radical axis was used by the French mathematician M. Chasles

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