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“4.2直线、射线、线段”是《数学》(人教版)七年级上册的内容,是学生在小学认识并且初步了解了研究平面图形的方式方法后的再认识,再学习.本课教材重点介绍线段、射线和直线的概念,结合生活中有关线的形象,探索线段、射线和直线的特征与基本性质,进一步培养学生学习几何知识的信心,为几何学习的入门打好基础.本节课要求限定在进一步认识线段、射线和直线,掌握它们各自不同的表示方法,发现“两点确定一条直线”的规律.本节课根据“课标”的具体目标,结合所在学校初
“4.2 lines, rays, lines ” is “Mathematics” (PEP) seventh grade content, is the students in primary schools to understand and preliminary understanding of the method of planar graphics after the re-understanding and relearning. The textbook focuses on the concept of line segments, rays and lines, and combines the characteristics of the line, ray and line in life with the basic characteristics to further develop students’ confidence in learning geometric knowledge and lay the foundation for the entry of geometry learning. Lesson requirements are limited to further understanding of the line, ray and line, to grasp their different representation, and found “two points to determine a straight line ” in this lesson based on Early school