三角形的分类是“三角形的认识”中的重要内容。许多教师只让学生根据教师的提问、示范 ,进行观察、比较、操作、分类 ,亦步亦骤地完成任务 ,学生参与缺乏积极性、主动性、创造性。而我校王老师的教学令人耳目一新 ,它是这样教学的。师 :请各小组从第一个信封中取出三角形卡片 The classification of triangles is an important part of the “triangle of knowledge.” Many teachers only allow students to demonstrate, observe, compare, operate, and categorize students according to teachers 'questions, and accomplish their tasks step by step. Students' lack of initiative, initiative and creativity involves them. The teaching of my school Wang refreshing, it is such a teaching. Teacher: Ask each group to remove the triangle card from the first envelope