Radical axis

（重定向自Radical axes）

If the two circles intersect, the radical axis is the secant line corresponding to their common chord.

Figure 2: The radical center (orange point) is the center of the unique circle (also orange) that intersects three given circles at right angles.

The radical axis (or power line) of two circles is the locus of points at which tangents drawn to both circles have the same length. For any point P on the radical axis, there is a unique circle centered on P that intersects both circles at right angles (orthogonally); conversely, the center of any circle that cuts both circles orthogonally must lie on the radical axis. In technical language, each point P on the radical axis has the same power with respect to both circles

单词	Radical axes
释义	Radical axes 英语百科 Radical axis （重定向自Radical axes） The radical axis (or power line) of two circles is the locus of points at which tangents drawn to both circles have the same length. For any point P on the radical axis, there is a unique circle centered on P that intersects both circles at right angles (orthogonally); conversely, the center of any circle that cuts both circles orthogonally must lie on the radical axis. In technical language, each point P on the radical axis has the same power with respect to both circles
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