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教学平面组合图形面积的计算,要注意引导学生观察分析,发展他们的视图能力、综合运用知识的能力和抽象思维的能力。在进行分析、综合的过程中,一定要使学生逐步理解无论怎样割补,必须遵循四个原则:①割补后的图形,必须是已学过的基本图形;②割补后的图形要具备计算面积不可少的数据;③要能根据条件,讲叙求面积的思路;④要选择简便的计算方法。例1 求图1(1)的面积(单位:米)
Teaching plane combination graphics area calculation, should pay attention to guide students to observe and analyze, develop their ability to view, comprehensive use of knowledge and ability to abstract thinking. In the process of analysis and synthesis, we must make students gradually understand that no matter how to make up, four principles must be followed: ① the figure after the cut must be the basic figure that has been learned; ② the figure after the cut has to have Calculate the area of essential data; ③ to be able to speak according to conditions, say the idea of seeking area; ④ to choose a simple calculation method. Example 1 See Figure 1 (1) of the area (in meters)