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几何证题的关键在于寻找已知和求证的联系。辅助线就起着一个桥梁的怍用.同一个题,思考的角度不同,引出的辅助线也就不同,证明过程的繁简,巧拙也就大不一样,下面通过一个例题给予简要概说。
The key to a geometrical test is to find the connection between known and proven. The auxiliary line plays a role in the bridge. The same problem, the angle of thinking is different, and the auxiliary line that leads out is also different. The complexity of the proof process is very different. The following gives a brief overview through an example.