高一数学必须修读二2_3_1.ppt

Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 问题1：请同学们观察图片,说出旗杆与地面、 大桥桥柱与水面是什么位置关系？ 垂直 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 问题2：如图，在阳光下观察直立于地面旗杆AB及它在地面的影子BC，旗杆所在的直线与影子所在直线位置关系是什么？ 旗杆AB不仅与地面上任意一条过旗杆底部B的 直线垂直，且与地面上任意直线a也是垂直的 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 1、根据定义，一条直线与一个平面垂直，则这条直线和平面 内 。 记作： 。 l P 直线l的垂面 垂足 任意一 条直线都垂直 直线与平面的一条边垂直 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 知识与技能 1.掌握空间中直线与平面垂直的判定定理； 2.会用判定定理证明直线与平面垂直； 3.学会用符号语言判定直线与平面垂直。 过程与方法 培养学生的几何直观能力，使他们在直观感知，操作确认的基础上学会归纳、概括结论。 情感态度与价值观 培养学生学会从“感性认识”到“理性认识”过程中获取新知。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 思考： 如何证明直线与平面垂直? 是否一定要证明直线与平面中的所有直线垂直? 当折痕AD是三角形的高时，AD才会与平面垂直 即，当AD与两条相交直线垂直，AD⊥ a Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 问题 × Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright