2021年初二数学正方形教案.pdf

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1、初二数学正方形教案|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 1 页，共 3 页第 2 页初二数学正方形教案正方形一、教学目的1.掌握正方形的概念、性质和判定，并会用它们进行有关的论证和计算.2.理解正方形与平行四边形、矩形、菱形的联系和区别，通过正方形与平行四边形、矩形、菱形的联系的教学对学生进行辩证唯物主义教育，提高学生的逻辑思维能力.二、重点、难点1.教学重点：正方形的定义及正方形与平行四边形、矩形、菱形的联系.2.教学难点：正方形与矩形、菱形的关系及正方形性质与判定的灵活运用.三、例题的意图分析本节课安排了三个例题，例 1 是教材 P

2、111 的例 4，例 2 与例3 都是补充的题目.其中例 1 与例 2 是正方形性质的应用，在讲解时，应注意引导学生能正确的运用其性质.例 3 是正方形判定的应用，它是先判定一个四边形是矩形，再证明一组邻边，从而可以判定这个四边形是正方形.随后可以再做一组判断题，进行练习稳固(参看随堂练习1)，为了活泼学生的思维，也可以将判断题改为以下问题让学生思考：对角线相等的菱形是正方形吗?为什么?|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 2 页，共 3 页文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6

3、L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2

4、 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6

5、L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2

6、 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6

7、L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2

8、 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6

9、L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3第 3 页对角线互相垂直的矩形是正方形吗?为什么?对角线垂直且相等的四边形是正方形吗?为什么?如果不是，应该加上什么条件?能说四条边都相等的四边形是正方形吗?为什么?说四个角相等的四边形是正方形对吗?四、课堂引入1.做一做：用一张长方形的纸片(如下图)折出一个正方形.学生在动手做中对正方形产生感性认识，并感知正方形与矩形的关系.问题：什么样的四边形是正方形?正方形定义：有一组邻边相等并且有一个角是直角的平行四边形叫做正方形.指出：正方形是在平行四边形这

10、个大前提下定义的，其定义包括了两层意：(1)有一组邻边相等的平行四边形(菱形)(2)有一个角是直角的平行四边形(矩形)2.【问题】正方形有什么性质?由正方形的定义可以得知，正方形既是有一组邻边相等的矩形，又是有一个角是直角的菱形.所以，正方形具有矩形的性质，同时又具有菱形的性质.五、例习题分析|精.|品.|可.|编.|辑.|学.|习.|资.|料.*|*|*|*|欢.|迎.|下.|载.第 3 页，共 3 页文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8

11、 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9

12、R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8

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14、R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8

15、 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9R7H3文档编码:CP6L5P2R4D8 HD4Z4C9H4C2 ZV3M5N9

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