2022年八年级数学四边形教学设计 .pdf

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1、学习好资料欢迎下载桃江玉潭实验学校初中部教 学 设 计第（11）节学习主题：多边形的内角和与外角和(1)学习目标：1 通过具体情景了解多边形的概念，掌握四边形和多边形的内角和。2 会利用多边形的内角和进行计算。3 通过多边形内角和公式的推导过程，培养学生的发散思维能力，逐步提高推理的能力。4 通过现实中抽象出多边形概念，让学生再次体会数学来源于生活，从而认识到数学的应用价值，提高学习数学的热情。教学重点：多边形的概念，四边形和多边形的内角和难点：多边形内角和公式的推到过程。学习环节学习活动学习方式一 创设情境，导入新课1 三角形的内角和等于多少？（180）2 四边形的内角和等于多少呢？为什么？

2、四边形的内角和等于360o，理由是：连结 AC，则四边形ABCD 被分成了两个三角形，因此四边形的内角和等于一个三角形的内角和的2 倍。即：2 180 o=360 o由此得到:四边形的内角和等于 360o多边形的内角和与外角和(1)（板书课题）二 合作交流，探究新知1 请你说一说什么叫多边形？在平面内，由一些线段首尾顺次相接组成的封闭图形叫做多边形。组成多边形的各条线段叫多边形的边，每相邻两条边的公共端点叫多边形的顶点，连结不相邻两个顶点的线段叫做多边形的对角线，DCBA顶点对角线角边EDCBAEDCBA学习好资料欢迎下载相邻两边组成的角叫多边形的内角。简称多边形的角。说明：我们的课本今后说的

3、多边形都是凸多边形，即：多边形总在一条边所在的直线的同旁。2 五边形的内角和如图，五边形的内角和等于多少呢？（交流讨论）估计学生会想到下面方法：方法 1 连结 AD,AC，则五边形别两条对角线分成了三个三角形，所以五边形的内角和等于3180o=540o归纳：n 边形的内角和等于（n-2）180o三 课堂练习，巩固提高1 P 114 1,2 补充：1 一个多边形的内角和不可能是()A 560oB 1080oC 720oD 1800o2 一个多边形的内角和是2340o，这个多边形是_边形。3 一个多边形的边数增加1，内角和增加多少呢？四 反思小结，拓展提高OEDCBA文档编码:CP10N6H4Z8

4、X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B

5、4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6

6、文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4

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8、5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5

9、H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6

10、H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6文档编码:CP10N6H4Z8X7 HG8C6J2N5B4 ZX8P2O1M5H6学习好资料欢迎下载精典作业设计：教学反思：文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5

11、文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:C

12、I3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2

13、D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 H

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15、T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10

16、ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7

17、U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5学习好资料欢迎下载桃江玉潭实验学校初中部教 学 设 计第（12 ）节学习主题：多边形的内角和与外角和（2）学习目标：1 了解多边形的外角和的概念、掌握多边形的外角和公式。2 了解正多边形的概念。3 了解四边形的不稳定性及生活中的运用。4 通过多边形内角和的探索，让学生体验从特殊到一般的思考方法教学重点与难点：多边形的外角的概念、多边形的外角和公式。难点：多边形外角和公式的推导过程。学习环节学习活动学习方式一 创设情境

18、，导入新课1 如图，AB DE,AC DF,那么 A 与 D 有什么关系？为什么？你能有一句话表达这个结论吗？解：A=D，理由是：设AC 与 DE 交于 C，AB DE,AC DF A=ACD=D 如果一个角的两边和另一个角的两边分别平行，而且开口方向一致，那么这两个角相等。2 四边形的内角和=_,n 边形的内角和=_.3 什么叫三角形的外角？什么叫三角形的外角和？三角形的外角和等于 _.三角形的一边和另一边的延长线组成的角叫三角形的外角，三角形的每一个内角的外角（共三个）的和叫三角形的外交和，三角形的外角和等于180o4 类似地，多边形一边和另一边的反向延长线组成的角叫多边形的外角，在每个顶

19、点处取这个多边形的一个外角，它们的和叫多边形的外角和。5 我们知道多边形每多一条边，多边形的内角和就多180o，外角和多多少度呢？你猜猜看.你的猜想对吗？下面我们来学习多边形的内角和与外角和（2）二 合作交流，探究新知文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P

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22、7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y

23、5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:

24、CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B

25、2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2

26、HT4M4P6T3A10 ZN10M7U4J5Y5学习好资料欢迎下载1 特殊多边形的外角和（1）等边三角形的每一个内角等于_,每一个外角等于_,外角和等于 _,(2)正方形的每一个内角等于_,每一个外角等于_,外交和等于 _,(3)如果五边形的每个内角是相等的，这个五边形的每一个内角等于 _,每一个外角等于_,外交和等于 _。（3）如果六边形的每个内角是相等的，这个六边形的每一个内角等于_,每一个外角等于_,外交和等于_。从上面的多边形看到，边数增加，外角和并没有增加，都是360 o，但这些多边形的是特殊的，是否任意的多边形内角和都等于360 o呢？2 普通多边形的外角和（1）四边形的外角和如

27、图，四边形 ABCD 的四个外角1+2+3+4=?用什么方法来求？(2)n 边形的外角和等于多少呢？（交流讨论）归纳：n 边形的外角和等于360o3 正多边形的概念观察下面多边形，它们的角和边有什么特点？（边都相等，角也都相等）在平面内，边都相等、角也都相等的多边形叫正多边形。4 四边形的不稳定性三 应用迁移，巩固提高例 1 一个多边形的内角和等于它的外角和的5 倍，它是几边形？四 课堂练习，巩固提高1 一个多边形的每一个外角都等于45o，这个多边形是几边形？它的每一个内角等于多少度？2 正 12 边形的每一个内角等于多少度？每一个外角等于多少度？3 下图是三个完全相同的正多边形拼成的无缝隙不

28、重叠的图形的一部分，这种多边形是几边形？五 反思小结，拓展提高文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2

29、HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P

30、6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10

31、 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M

32、7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y

33、5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:

34、CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5学习好资料欢迎下载板书设计：精典作业设计：文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN

35、10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4

36、J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档

37、编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3

38、X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2

39、B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4

40、M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3

41、A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5学习好资料欢迎下载教学反思：教 学 设 计第（13）节学习主题：平行四边形 的性质学习目标：知识与技能目标：引导学生通过操作与探索认识平行四边行的边、角的位置关系与数量关系和它的中心对称性。过程与方法目标：学生在操作与探索中，发现平

42、行四边形的特征。情感与态度目标：在教学中通过学生操作探索激发学生的学习兴趣，培养学生的动手能力及观察能力。教学重点：平行四边形的特征：两组对边分别平行,对边相等，对角相等。学习环节学习活动学习方式一、导入新课：平行四边形是随处可见的熟悉的图形。请看桌面、书面等，甚至阳光照耀下它的影子都是平行四边形。在四边形中，实用价值最大的也是平行四边形。如汽车的防护链，无轨电车的电竿都是平行四边形状。那么平行四边形有什么特征呢？二、新授目标：这就是我们本节课研究的主要内容。（板书课题）三、小组讨论：1、什么是平行四边形？2、对照三角形的表示方法，你会怎么表示平行四边形？3、平行平行四边形还有什么特征？四、反

43、馈矫正：1、有两组对边分别平行的四边形叫做平行文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T

44、3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 Z

45、N10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U

46、4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文

47、档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI

48、3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D

49、2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5文档编码:CI3X4B2D2B2 HT4M4P6T3A10 ZN10M7U4J5Y5学习好资料欢迎下载四边形。2、一个四边形必需具备两组对边分别平行，这样才是平行四边形，反过来，平行四边形一定有“两组对边分

50、别平行”，因此，这定义既是平行四边形的一个判定，又是它的一个特征。3、平行四边形用符号“”表示 顶点用四个大写字母表示。如平行四边形 ABCD，记作“ABCD”。五、动手实践：一）、操作：1：按下面步骤在方格纸上画一个平行四边形.步骤：（1）画两条平行线。（2）画两条平行线上分别取点A 和点 B，联结 AB。（3）沿着水平方向平移AB 到 DC，就得到 ABCD。思考：四边形 ABCD 为什么就是平行四边形？请一同学说明道理。（学生小组讨论之后让几个同学说明）线段 AB 平移到 DC，由平移的特征可知ABDC，又 已 知ADBC 根据平行四边形定义知四边形ABCD 就是平行四边形。2、仿图 1