本节课是在研究了点与圆的位置关系之后研究直线与圆的位置关系,而前者通过两种方式去描述其位置关系:一是数学直观;二是借助点与圆心的距离d与圆的半径r的大小关系.在这里,可以借助类比的数学思想方法来研究直线与圆也有三种位置关系,两种方式去描述其位置关系:一是直线与圆的公共点的个数;二是圆心到直线的距离d与圆半径r的大小关系.这两者本身也相互对应、相互联系.基于以上分析,可以确定本节课的教学 This lesson is to study the relationship between the point and the circle after the study of the relationship between the line and the circle, while the former through two ways to describe the position relationship: First, mathematical intuition; the second is by means of the distance between the point and the center of the circle d The size of the relationship between the radius r. Here, you can use analogy to think of mathematical methods to study the line and the circle also has three kinds of positional relationship, two ways to describe the positional relationship: First, the number of points between the straight line and the circle; Is the center of the line to the distance d and the radius of the radius r relationship between the two also correspond to each other and interrelated based on the above analysis can determine the teaching of this lesson