一、教材简介“圆和圆的位置关系”一课是四年制初中《几何》第三册第１３课的内容 ,这一课是继学习了点和圆的位置关系、直线和圆的位置关系之后的又一部分内容 ,是初中几何中的重点 ,也是难点 ,主要是由于这节课的概念多、性质多 ,且比较抽象。这节内容是前两部分内容的延伸 First, the textbook introduction “The positional relationship between the circle and the circle” is the content of Lesson 13 of the fourth-year junior high school “Geometry”. This lesson is followed by the positional relationship between the points and the circle, the position of the straight line and the circle. Part of the content after the relationship is the focus and difficulty in the geometry of junior high school. It is mainly due to the fact that this lesson has many concepts, many natures, and it is relatively abstract. This section is an extension of the first two parts