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抽象出射线、直线的几何特征,理解其本质含义对学生而言并不容易。教学过线段、射线、直线相关内容的教师往往会有这样的经验:学生会误认为线段就是一根毛线,射线就是激光笔发射出的光线,认为黑板上所画的直线长度是有限的,当学习射线、直线的时候,二年级学过的线段又有所遗忘。因此,在教学中,有必要对线段的相关知识做简要复习,并进一步帮助学生认识线段、射线、直线的几何模型本质。那么如何选择合适的线段、射线、直线的几何原型?
Abstraction of the ray, the geometric features of a straight line, to understand its essential meaning is not easy for students. Teachers teaching line, ray, and line-related content tend to have such experience that students mistakenly believe that a line segment is a hairline, a ray is a light emitted by a laser pointer, and the length of a straight line drawn on the blackboard is limited. When learning Ray, straight line, the sophomore learned the line has been forgotten. Therefore, in teaching, it is necessary to make a brief review of the relevant knowledge of line segments and further help students to understand the essence of geometric models of line segments, rays and straight lines. So how to choose the right line, ray, straight line geometric prototype?