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1 教材分析1.1 本章概述本章教材是7～9年级“空间与图形”的开始部分,介绍了生活中多姿多彩的图形,直线、射线、线段,角的度量,角的比较与运算等内容.此内容对整个初中几何课起到了奠基作用.从不同方向看立体图形和展开立体图形让学生在欣赏几何图形之美的同时,体验到立体图形与平面图形的相互转换,帮助学生初步建立空间观念,发展学生的几何直觉,有利于学生的思维发展.线段与角是最简单的几何图形,但是所有的复杂图形都是由这些简单图形所组成的,而有关线段、角的概念、性质等都是以后研究复杂图形,如两条直线的位置关系、三角形、四边形……的必备根基,有
1 Analysis of Teaching Materials 1.1 Overview of the Chapter This chapter is the beginning of the 7th to 9th grade “Space and Graphics”. It introduces colorful figures in life, such as straight lines, rays, line segments, angle measurements, angle comparisons and calculations, etc. Content. This content has played a fundamental role in the entire junior high school geometry class. Looking at the three-dimensional graphics and the three-dimensional graphics in different directions allows students to experience the beauty of geometric figures while experiencing the mutual transformation between three-dimensional graphics and plane graphics, helping students to initially establish space. Concepts and development of students’ geometric intuitions are conducive to the development of students’ thinking. Segments and angles are the simplest geometric figures, but all complex figures are composed of these simple figures, and the concept, nature, etc. of line segments, angles, etc. All of these are the essential foundations for later research on complex graphics, such as the positional relationship between two straight lines, triangles, and quadrilaterals.