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本章一方面是初中“图形与几何”邻域的第一章,又是小学相关知识的继续,部分的概念在小学也接触过,比如直线,射线,线段和角.但这些初步的认识还不够,我们将通过本章的学习,从理解角的大小,角的和与差,角平分线的意义及数量关系展开学习.希望大家能够用图形语言,文字语言,符号语言综合描述角的大小,角的和与差关系及角平分线.学习重点:1.常见几何体的识别.2.角的比较与度量.3.余角补角的概念与性质.4.直线,射线,线段和角的概念和性质.
This chapter, on the one hand, is the continuation of the elementary school-related knowledge in junior high school and the first chapter in the neighborhood of “Graphics and Geometry,” and some of the concepts are also touched on in primary schools, such as lines, rays, lines and angles. Not enough, we will learn from this chapter, from understanding the size of the angle, the angle and the difference, angle bisector of the meaning and the number of learning to start.We hope that we can use graphic language, text language, symbolic language to describe the size of the angle , The relationship between the angle and the difference and the angle bisector. Learning points: 1. Identification of common geometric bodies .2. Comparison and measurement of angles .3. Concept and nature of the complement angle .4 Line, ray, line and angle Concept and nature.