《直线和线段》导课设计种种

Designs for presentation of straight line and line segment

直线和线段是几何初步知识中的起始概念 ,也是进一步学习平面图形的基础 ,这两种线有别于学生在生活中见到的各种实物“线”。为使抽象的概念得到生动的掌握 ,笔者根据直线和线段的共性和个性 ,结合教学的重点难点 ,设计了几种既形象又有趣的导课方法 。

Straight line and line segment are fundamental concepts at the level of preliminary stage of geometry learning, and also the basis of further study in plane figure. These two sorts of lines are different from various substantial lines that the students meet in their real life. In order to help the students grasp the abstract conception, the writer takes the key and difficult teaching points into account and designs the presentation of straight line and line segment in interesting and visual ways by considering the general and specific character of the lines. It proved that those designs have achieved good effect in teaching practice.