片断一师:同学们,我们已经学过哪些平面图形?(教师根据学生回答分类板书。)师:请同学们拿出按照课本第145页剪下的8个平面图形,说说哪些图形是轴对称图形,然后再想办法验证。(学生先推测,然后动手折图验证,最后举手回答。)生:第一个图形是等腰三角形,它是轴对称图形,有一条对称 Teacher: Please have the students come up with eight plan graphics cut out of page 145 of the textbook, and tell which graphics are the axes Symmetrical graphics, and then think of ways to verify. (Students first speculate, and then hands-on verification, and finally raised his hand to answer.) Health: The first graphic is an isosceles triangle, which is an axisymmetric graphics, there is a symmetry