人教版七年级上册第四章所涉及的的几何知识中,最重要的就是线段的中点和角平分线,而这两个知识之间却有着许多相似之处。线段的中点和角平分线的一些性质可以类比得到,本文介绍一些解题中常用的模型,从模型出发得到相应的性质和结论。 Among the geometric knowledge involved in Chapter Four of the PEP Edition Seven, the most important one is the midpoint of the line segment and the bisector of the angle, and there are many similarities between the two. Some properties of the midpoint of the line segment and the angle bisector can be obtained analogically. This paper introduces some commonly used models in solving problems, and gets the corresponding properties and conclusions from the model.