文档介绍：特殊的平行四边形特殊的平行四边形 矩形矩形 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 1. ? 什么叫平行四边形? 2. ? 平行四边形有哪些性质? ①①平行四边形的对边平行且相等平行四边形的对边平行且相等. .②②平行四边形的对角相等,邻角互补平行四边形的对角相等,邻角互补. . ③③平行四边形的对角线互相平分平行四边形的对角线互相平分. . ABC D 两组对边分别平行的四边形叫做平行四边形 . 两组对边分别平行的四边形叫做平行四边形 . Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 联系生活?请同学们举出生活中的矩形实例 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 五星红旗电视机面香港区旗手表窗框书桌面课本封面地砖生活中的矩形: Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 有一个角是直角的平行四边形是矩形探究矩形的定义: 平行四边形矩形矩形是特殊的平行四边形有一个角是直角 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 练兵场: 试试你的身手吧,相信自己绝对能行! (一)请用所学的知识诊断下面的语句,若正确请在括号里打“√”若“有病”请开药方: ,特殊之处就是有一个角是直角.( ) . ( ) ( 如平行四边形的对边平行且相等;平行四边形的对角相等; 平行四边形的对角线互相平分.)矩形也具有. ( ) √√有一个角是直角的平行四边形是直角 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. C