English: The radical axis of two intersecting circles connects their two points of intersection. If the circles are tangent (i.e., intersect at only one point), the radical axis is their mutual tangent line. In both cases, the radical axis is perpendicular to the line connecting the centers of the two circles.
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{{Information |Description={{en|1=The radical axis of two intersecting circles connects their two points of intersection. If the circles are tangent (i.e., intersect at only one point), the radical axis is their mutual tangent line. In both cases, the r