圆是初中几何的重点内容,因而它是中考中的必考内容,在解与圆有关的问题时,适当地添加辅助线,可以为解(证)题搭桥铺路,沟通题设与结论之间的联系,以下以近年各地的中考题为例,介绍圆中辅助线添加的常用方法.供读者学习参考. The circle is the key content of the junior high school geometry, so it is a mandatory examination content in the middle school exam. When solving the problems related to the circle, the auxiliary line is appropriately added, and the bridge can be paved for the solution of the problem, and the communication problem is set between the conclusion and the conclusion. For the following links, we will use the exam questions in various places in recent years as an example to introduce common methods for adding auxiliary lines in circles.