“圆”是特殊的平面曲线图形,近年来,利用圆中的基本性质及定理,构造辅助圆来解决问题,在各地中考中备受青睐.虽然应用的知识点比较简单,但是在动态问题中,对学生的能力要求比较高,因此,学生们需要深刻理解基础知识,才能灵活解题.笔者归纳出三类适合添加辅助圆来解决的问题,现结合试 “Circle” is a special plane curve graph. In recent years, the basic nature and theorem in the circle have been used to construct an auxiliary circle to solve the problem. They are favored in local examinations. Although the applied knowledge is relatively simple, it is dynamic. In the problem, the student’s ability requirements are relatively high. Therefore, students need to understand the basic knowledge in order to solve the problem flexibly. The author has summarized three types of problems that are suitable for adding supplementary circles to solve problems.