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1、多边形的面积复习课教学设计昆明呈贡新区第一小学李志梅一、教学内容：多边形的面积复习第一课:概念的理解和深化二、教学目标:1回忆已学图形的面积公式推导过程，弄清图形的面积之间的联系，使之形成网络，为实际计算打下基础。2利用大量的具体图形帮助学生理解基础图形之间的联系和变化规律，提高学生分析和综合概括的能力。3、通过一题多解、发展创新的解题方式，培养学生乐于思考，认真负责的学习态度。三、教学重点：弄清基础图形的面积之间的联系，知道如何计算基础图形的面积。教学难点：通过数形结合的方法分析和概括出图形之间的关系。四、教学过程：一数形结合，回顾面积推导过程1.出示正方形和长方形纸片：说一说，你知道关于这
2、个图形的哪些知识？2.课件演示：一个平行四边形沿一条高剪开，通过平移拼接的方式变化成一个长方形。提问：.刚才的平行四边形发生了什么变化?.描述一下他的变化过程。3.课件演示：两个完全相同的三角形，通过平移和旋转拼接成一个平行四边形。提问：.刚才的三角形怎样变化了?.拼成的平行四边形和原来的三角形有什么关系？4.课件演示：两个完全相同的梯形，通过平移和旋转拼接成一个平行四边形。提问：.描述一下梯形的变化。.拼成的平行四边形和原来的梯形形有什么关系？二说一说计算面积课件依次出现长方形、正方形、平行四边形、三角形、梯形和相关量的长度，让学生说一说如何计算，不要求具体计算结果。三图形的拼组1.课件出示
3、两个完全一样的锐角三角形、钝角三角形、直角三角形、等腰直角三角形，提问你可以拼出什么图形？演示拼组过程。再提问我们得到了什么结论？2.出示：三个完全相同的三角形，又可以拼出什么图形？我们得到了什么结论？四概念巩固1.判断题文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1
4、ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V
5、9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1
6、ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V
7、9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1
8、ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V
9、9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4下图两个平行四边形面积相等。下图三个三角形面积相等。三角形面积是平行四边形面积的一半。两个面积相等的梯形，形状是相同的。两个三角形的高相等
10、，它们的面积就相等。平行四边形的底越长，它的面积就越大。面积相等的两个梯形一定能拼成一个平行四边形。面积相等的两个三角形，形状也一定相同。2填空题一个平行四边形面积是40 平方厘米，与它等底等高的三角形面积是（）平方厘米。一个平行四边形的面积是16 平方厘米，从这个平行四边形中剪出一个最大的三角形，这个三角形的面积是（）平方厘米。3.选择题两个平行四边形面积相等，它们的底和高（）。求直角三角形的面积哪些算式正确？（）。一个三角形，高不变，底扩大3 倍，面积就扩大（）倍。如果一个三角形的底和一个平行四边形的底相等，面积也相等，平行四边形的高是10 厘米，那么三角形的高是().4.计算多边形的面积
11、五：课堂小结文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1
12、C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1
13、I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1
14、C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1
15、I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1
16、C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1
17、I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4和大家分享一下你的复习小窍门！文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K
18、4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB
19、1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K
20、4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB
21、1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K
22、4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4文档编码:CV5V9S8D1C6 HB1G4E6E9K1 ZV4L1I7A7K4