在圆这章中切线这部分内容的重要性不言而喻,这方面的例子也是举不胜举,本人结合多年的教学实践谈以下几点:一、锁定切线与直径垂直关系,寻找解题方法切线是圆中非常重要的一个知识点,在解有关题目时用到的知识点比较多,难度比较大,灵活性比较强。教师在分析问题的过程中要反复强调重点,归纳总结思维方式,从而加深学生的印象。在题目中如果 The significance of this part of the tangential line in this chapter is self-evident. Examples in this area are too numerous to mention. I will combine the years of teaching practice to talk about the following points: First, to lock the vertical relationship between the tangent and the diameter, to find a solution to the problem Tangential line is a very important point in the circle, when used to solve the relevant topics more knowledge points, more difficult, more flexible. Teachers in the process of analyzing the problem to repeatedly emphasize the key points, summed up the way of thinking, thereby deepening students’ impressions. If in the title