平面几何入门阶段的概念比较集中。根据初二学生的思维和心理特点,平面几何入门阶段的概念教学要注意以下几个问题:一、抓住本质特征,讲清概念大多数教师在引入新概念时能联系实际。例如,在讲“平行线”时,从“铁轨、路灯电线”谈起;在讲“三角形任何两边之和大于第三边”时,从“抄近路”谈起;在讲“相似形”时,从“放大照片”谈起,等等。用实例引入 Plane geometry getting started stage concept is more concentrated. According to the thinking and psychology characteristics of the first two students, the concept teaching of the plane geometry should pay attention to the following questions: First, grasp the essential characteristics, clarify the concept Most teachers can contact the actual when introducing new concepts. For example, talking about “parallel lines” starts with “railroad tracks and street lamps”; when talking about “the sum of any two sides of the triangle is greater than the third one,” we start with “short cut.” When talking about “similar shapes” , From the “zoom in” talk, and so on. Introduced with examples