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两圆中的有关线段平行与垂直关系,是两圆相交、相切中的基本结论,具有普遍性.在有关两圆相交、相切关系的几何题的证明中常常用到这些关系.一、平行关系
The parallel and perpendicular relationship between the relevant segments in the two circles is the basic conclusion in the intersection and tangency of the two circles. It has universality. These relations are often used in the proof of geometric problems concerning the intersection and tangency of two circles. relationship