相似三角形概念的教学设计（The teaching design of the concept of similar triangle）.docVIP

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相似三角形概念的教学设计（The teaching design of the concept of similar triangle）.doc

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相似三角形概念的教学设计（The teaching design of the concept of similar triangle）

相似三角形概念的教学设计（The teaching design of the concept of similar triangle） By reading guomuchengsong to, most are not good. - Zheng Banqiao The teaching design of the concept of similar triangle Macao university middle school Zhaoshanjun 2009/07 The main points of knowledge about the similar triangle units include four main contents: concept, nature, judgment and application. Among them, the teaching of the concept is especially important. We use a lesson to study. Who corresponds to whom, who is similar to is the key, but also the difficulty of students. We are not from the definition from the original human how to know the similarity to recover the original simplicity on the PG_Lab platform, to explore and guide students to observe and analyze the thinking, finally summarize the mathematical definition of similar. In order to solve the problem of who corresponds to whom and who is similar, we also designed some formative exercises to make some preliminary preparations for the subsequent problem solving. First, the problem of similar triangle is put into the dynamic graph transformation Human beings initially realized that congruent did not come from ASA or SAS, but from replication. Similarly, man first realized that similarity does not come from the proportion of corresponding sides, but from scaling. Copy or zoom is a graphical transformation, and PG_Lab is a good tool for dynamic demonstration of graphical transformations. We use the teaching model of teacher demonstration and student discussion to investigate the problem of similar triangles in dynamic graph transformation. order Teacher Student Legend Explain One 1. to ABC 2. replicate ABC Put questions to: What is the relationship between the 1. of the two delta? 2. what is it? What are the features of 3. congruent graphs? Watch carefully Congruent May coincide Of equal shape and equal size Students see the replication process namely Two 1. ABCamplification Put questions to: 1. when two delta relations? discuss T