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【教学案例】八年级数学上册中“图形的旋转”。(课件出示生活中的旋转案例:螺旋桨、摩天轮、时钟等)师:我们已经学习过几种物体的运动,请观察大屏幕,这些是什么运动呢?生:旋转。师:是的,这些物体都在做一种生活中常见的运动———旋转,请大家仔细观察,结合生活中的例子想一想,这样的运动有什么特点。生1:他们都绕着一个点在旋转。生2:旋转时物体的形状大小不变。生3:他们旋转时绕了一个圆圈。师:同学们的眼力真好,一下子看出这么多特点来,回忆一下,生活中还有类似的运动吗?生1:电风扇。
[Teaching Case] The mathematics of Grade 8 is the rotation of the graph. (Courseware shows life in the case of rotation: propeller, Ferris wheel, clock, etc.) Teacher: We have learned the movement of several objects. Please observe the big screen. What is these movements? Health: rotation. Teacher: Yes, these objects are doing a kind of common movement in life—rotation. Please observe carefully and think about the examples in life. What are the characteristics of such a sport? Student 1: They are all spinning around one point. Student 2: The shape of the object does not change during rotation. Health 3: They circled a circle when they rotated. Teacher: The classmates’ eyesight is really good. All of a sudden, they have seen so many features. Remember that there is similar movement in life. Health 1: Electric fan.