1一个案例1.1问题由来2010年上海市普通高等学校春季招生考试结束后,我校高三学生练习了这份招生数学试卷,其中的第13题是:在图1所示的斜截圆柱中,已知圆柱底面的直径为40cm,母线长最短50cm,最长80cm,则斜截圆柱的侧面面积S=cm2.批改时发现该题得分较低.我们觉得这并不是什么难题,为什么会有这么多人出错?为了弄清同学们出错的原因,讲评时提问了几个做错了的同学,他们都说不知道这个图形的侧面 1 A Case 1.1 The Origin of the Problem After the Spring Enrollment Examination for Shanghai General Colleges and Universities was completed in 2010, the third year high school students practiced the enrollment math test paper. The 13th question is: In the oblique cylinder shown in Figure 1, Know the diameter of the bottom surface of the cylinder is 40cm, the shortest bus length 50cm, the longest 80cm, the oblique side of the cylinder area S = cm2. Correction found that the problem scores lower .We think this is not a problem, why there is so much People make mistakes? In order to clarify the reasons for the students wrong, commenting when asked a few wrong students, they all say do not know the side of this figure