在初中平面几何三角形一章的教学中,翻阅有关书籍时,发现对折线、多边形的定义问题阐述得不确切,所以提出个人的一些看法与老师们探讨。一、有关折线的定义 1.教科书对折线没做文字阐述,只在图1—8中有两条折线作为与线段比较长短而出现。《几何辞典》(上海科学技术出版社1981年版)中折线的定义是: 折线:[英]Broken line许多直线端与 In the teaching of the chapter of the plane geometry triangle in junior high school, when I read the books, I found that the definition of the polyline and the polygon was inaccurate. Therefore, some personal opinions were discussed with the teachers. First, the definition of the fold line 1. The textbook did not elaborate on the fold line. Only in Figure 1.8, there are two fold lines appearing as the length of the line segment. The definition of the polyline in “Geometry Dictionary” (Shanghai Science and Technology Press, 1981) is: Polyline: [British]Broken line