我们深知辅助线是解决某些几何题的灵丹妙药,有许多同仁总结添加辅助线的方法与规律,但对辅助线引入的探讨却少的可怜.为了让学生对辅助线的引入不感到唐突,笔者谈一下如何讲解初中阶段第一条 We fully understand that the auxiliary line is a panacea for solving certain geometric problems. There are many colleagues who have summed up the methods and rules for adding auxiliary lines, but the discussion on the introduction of auxiliary lines is rather poor. In order to allow students to not feel abrupt on the introduction of auxiliary lines, The author talks about how to explain the first stage of junior high school