在解决与圆有关的几何问题时,常常需要添加适当的辅助线,将复杂的图形转化为基本图形,从而方便求解.现以中考题为例,对圆中辅助线的添加技巧分类总结如下,供同学们学习时参考.一、圆中有弦,常作弦心距(或者作垂直于弦的半径或直径,有时还要连接过弦端点的半径) When solving geometric problems related to circles, it is often necessary to add appropriate auxiliary lines to convert complex graphics into basic graphics so as to facilitate the solution. Now taking the examination questions as an example, the classification of auxiliary lines in the circle is summarized as follows. For students to learn when referencing. First, the circle has a chord, often as a string center distance (or as a radius or diameter perpendicular to the string, and sometimes also connected to the radius of the end of the string)