【案例】师:刚才同学们已学会用折、量、画等方法判断长方形和正方形是不是轴对称图形,接下来请同学们拿出老师给你们准备的图形纸片,也用同样的方法判断一下这些图形是不是轴对称图形。(教师给学生的图形是三角形、梯形和平行四边形) 【Case】 Teacher: Just now the students have learned how to judge whether the rectangle and the square are axisymmetric by using the method of folding, measuring, drawing, etc. Next, ask the students to come up with the graphic paper prepared by the teacher for you, and also use the same method to judge What is the shape of these graphs is not axisymmetric graphics. (Teachers give students graphics are triangular, trapezoidal and parallelogram)