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学生刚开始学习平面几何作图时,不会作,不会说,更不会写。为了帮助学生攻破作图这一难关,在角平分线、直线的垂线的作图教学中,我们将其方法通俗地称为“1—2—1”作图法,这便于学生掌握和记住作图的顺序和步骤,先做到会作,然后再训练会说、会写。一、由角平分线作图提出方法角平分线的作图过程可扼要叙述为:先由已知的一个点O(∠AOB的顶点),通过作
When students begin to learn about plane geometry drawing, they will not do it, they will not say it, and they will not write it. In order to help students overcome the difficulty of drawing, in the drawing teaching of angle bisectors and straight lines, we refer to the method as “1-2-2-1” drawing method, which is easy for students to master and remember. The sequence and steps of drawing pictures should be done first, and then training will be done and written. 1. The mapping process of the angle bisector of the method proposed by the angle bisector can be briefly described as follows: first by a known point O (the vertex of AOB),