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1、名师精编优秀教案平行四边形的判定第 2 课时平行四边形的判定（2）学习目标：1.进一步学习平行四边形的判定方法（一组对边法）；2.理解三角形中位线性质定理.重 难点：用三角形中位线性质定理解决一些简单的实际问题，平行四边形判定方法的运用.学习过程：复习：平行四边形的判定：（1）（2）（3）三角形的几种重要的线段：（1）中线：（2）角平分线：（3）高：二、探究新知1、将同样长的木条 AB、CD平行放置，说明试说明四边形ABCD是平行四边形（提示连接AC）说明过程：2、【归纳总结】平行四边形的判定方法四（一组对边法）：。结合图形，说明四边形ABCD 是平行四边形方法一：在四边形ABCD 中，有 A
2、B=AB/则四边形ABCD 是。方法二：在四边形ABCD 中，有A B D C 名师精编优秀教案 AD=AD/则四边形ABCD 是。3、看课本，回答问题。（1）叫做三角形的中位线。（2）一个三角形有条中位线，你能在图1 的三角形中画出三角形的中位线。4、探究三角形的中位线定理在图 2 中，我量线段 EF=，AB=，我可以猜测出线段EF与 AB的关系 式是。我还可以猜测出线段EF与 AB的位置关系是：。三、练一练如图 3，点 E、F 分别是ABC边 AC、BC上的中点，求证：EF=21AB，EF/AB。证明：（如图 4）延长 EF到 G,使 FG=EF 则CEF全等于BGF BG=，GF=，G=
3、则 CE/。（）即 AE/又 AE=所以四边形是平行四边形。（）所以 EG=，EG/。（平行四边形的）又因为 EF=FG 所以 EF=21 =21，EF/。四、课堂小结三角形的中位线定理：文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:C
4、B4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4
5、H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:C
6、B4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4
7、H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:C
8、B4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4
9、H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9名师精编优秀教案五、课堂作业1.已知：如图7，在 ABCD的边 AB、CD上分别取一个点E、F，使得 AE=21AB，DF=21CD，连接 BF、DE。求证：（1）四边形B
10、FDE 是平行四边形；（2）BF=DE。2、如图 6，顺次连结四边形ABCD 各边中点E、F、H、M，得到的四边形EFHM 是平行四边形吗？为什么？3、如图 7，设四边形EFHM 的两条对角线EH、F M的长分别为12、10，A、B、C、D分别是边EF、FH、HM、ME的中点，求ABCD 的周长。六、课后反思文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y
11、4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:
12、CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y
13、4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:
14、CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y
15、4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:
16、CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9名师精编优秀教案7C 学科网，最大最全的中小学教育
17、资源网站，教学资料详细分类下载！文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码
18、:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8
19、Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码:CB4J6M7U6Z3 HJ8B7Y8Y4H6 ZY3M8T9U2W9文档编码
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