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1、六垂六垂线和平行和平行线第一第一课时 相互垂直的含相互垂直的含义，间隔的含隔的含义 Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.分一分只填序号 直线有： 射线有：线段有： Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.1324567平
2、角直角锐角直角钝角锐角钝角Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.154326Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.1532相交不相交64Evaluation only.Created with Aspose.Slides
3、 for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.交点Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.两条直线相两条直线相交成几个角？交成几个角？ 两条直线相交两条直线相交有几个交点？有几个交点？ 1234角交点两条直两条直线相交成四个角，只相交成四个角，只需一个交点。需一个交点。Evaluation only.Create
4、d with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.123412343124察看两条直线相交的角，他发现了什么？图1图2图3两条直两条直线相交成四个角，相相交成四个角，相邻的两个角的两个角的和是的和是180度，相度，相对的两个角相等。的两个角相等。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty
5、Ltd.图3Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.两条直线相交成直角时，这两条直线相互垂直。其中一条直线叫做另一条直线的垂线。这个交点叫垂足。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.什么叫相互垂直？ACDBAB垂直于CDC
6、D垂直于ABAB和CD相互垂直交点垂足AB是CD的垂线或CD是AB的垂线两条直线相互垂直的时候，要用直角符号来表示出来。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.法官判案2、两条直线相交的交点叫垂足。 1、两条直线相交，这两条直线叫相互垂直. 3、直线b叫垂线。 如图abEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile
7、5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.生活中的垂直景象，他能找出哪些？Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.2、这几条线段中哪一条线段最短？ A1、从直线外一点A到这条直线能画几条线段？从直从直线外一点到外一点到这条直条直线能画无数条能画无数条线段。段。BCDE从直从直线外一点向外一点向这条直条直线所画的所画的一切一切线段中，垂直段中，垂直线段最短。段最短。A
8、C最短AC是这条直线的垂直线段。3、过直线外一点画这条直线的垂线能画几条？过直直线外一点画外一点画这条直条直线的垂的垂线只能画一条。只能画一条。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.从直线外一点到这条直线所画垂直线段的长度，叫做这点到直线的间隔。演示演示AEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.
9、0.Copyright 2019-2019 Aspose Pty Ltd.指出下面图中相互垂直的线Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.一、填空1、两条直线相交可以组成 个角，有 个交点。2、两条直线相交成 角时，这两条直线叫做 ，其中一条直线叫做另一条 直线的 ，两条直线的交点叫 。3、从直线外一点向这条直线所画线段中， 最短。4、过直线外一点画这条直线的垂线有 条。41直相互垂直垂线垂足垂直线段1Eva
10、luation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.12abc1=50， 2=40，那么直线c和直线b是什么关系？33=180 1 2 =180 50 40 =90答：直线c与直线b是相互垂直的关系。知：Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd
11、.以下图中哪些线是相互垂直的？拓展延伸ABCDEFABC3Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.以下图中哪些线是相互垂直的？拓展延伸ABCDEFEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.以下图中哪些线是相互垂直的？拓展延伸A
12、BCDEFEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.以下图中哪些线是相互垂直的？拓展延伸ABCDEFEvaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.以下图中哪些线是相互垂直的？拓展延伸ABCDEFEvaluation only.Cre
13、ated with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.小明假小明假设从从A A点横点横过马路，怎路，怎样走道路最短走道路最短？为什么？把最短的什么？把最短的道路画出来。道路画出来。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.3、从直线外一点到这条直线所画垂直线段的长度，叫做这点到直线的间隔。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2019-2019 Aspose Pty Ltd.
