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1、相似三角形的应用 1 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.怎样测量旗 杆的高度呢 ？Evaluation only.Evaluation only. Created with
2、Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.在平行光线的照 射下，物体所产生的 影称为平行投影。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.
3、2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.在阳光下，在同一时刻，物体的高度与 物体的影长存在某种关系：物体的高度越高 ，物体的影长就越长 在平行光线的照射下，不同物体的物高 与影长成比例 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile
4、 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.怎样测量旗 杆的高度呢 ？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client P
5、rofile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.cc、旗杆的高度是线 段 ；旗杆的高 度与它的影长组成什 么三角形？（ ） 这个三角形有没有哪 条边可以直接测量？温馨提示：BCRtABC6m2、人的高度与它的 影长组成什么三角形 ？（ ）这 个三角形有没有哪条 边可以直接测量？RtABC3、 ABC与AB C 有什么关系?试说明理由.1.2m1.6m8mEvaluation only.Evaluation only. Created with Aspose.Slides
6、for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.埃 及 风 景Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides
7、for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.胡夫金字塔是埃及现存规模最大的金字塔，被喻为 “世界古代七大奇观之一”。塔的个斜面正对东南西 北四个方向，塔基呈正方形，每边长约多米。据 考证，为建成大金字塔，共动用了万人花了年 时间.原高米，但由于经过几千年的风吹雨 打,顶端被风化吹蚀.所以高度有所降低 。 Evaluation only.Evaluation only. Created with Aspose.Slides fo
8、r .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.埃及著名的考古专家穆罕穆德决 定重新测量胡夫金字塔的高度.在一个 烈日高照的上午.他和儿子小穆罕穆德 来到了金字塔脚下,他想考一考年仅14 岁的小穆罕穆德.给你一条1米高的 木杆,一把皮尺, 你能利用所学知 识来测出塔高吗?1米木杆皮尺Evaluation onl
9、y.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Prof
10、ile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.古代一位数学家想出了一种测量金字塔 高度的方法:如图所示,为了测量金字塔的高 度OB,先竖一根已知长度的木棒OB,比较棒 子的影长AB 与金字塔的影长AB,即可近似 算出金字塔的高度OB.如果OB=1， AB =2，AB=274，求 金字塔的高度OB.OBAOBAEvaluation only.Evalua
11、tion only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.如图:为了估算河的宽度,我们可以在 河对岸选定一个目标作为点A,再在河的这 一边选点B和C,使ABBC,然后,再选点E, 使ECBC,用视线确定BC和AE的交点D.此 时如果测得BD=
12、120米,DC=60米,EC=50米, 求两岸间的大致距离AB. ABCD EEvaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.如图:为了估算河的宽度,我们可以在河对岸选 定一个目标作为点A
13、,再在河的这一边选点B和C,使 ABBC,然后,再选点E,使ECBC,用视线确定BC和 AE的交点D.此时如果测得BD=120米,DC=60米,EC=50 米,求两岸间的大致距离AB.ABCD E解: ADB = EDC ABC =ECD =900. ABD ECD ABEC=BDCD AB =BDEC/CD=12050/60=100（米）答：两岸间的大致距离为100米。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspo
14、se.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.我们还可以在河对岸选定一目标点A，再在河的 一边选点D和 E，使DEAD，然后，再选点B， 作BCDE，与视线EA相交于点C。此时，测得 DE , BC, BD, 就可以求两岸间的大致距离AB了。ADEBCEvaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client
15、Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.如图,小东设计两个直角来测量河宽DE,他量 得AD=2m,BD=3m,CE=9m,则河宽DE为 ( )(A).5m (B).4m (c).6m (D).8m 如图，小明在打网球时，使球恰好能打过网，而且 落在离网5米的位置上，求球拍击球的高度h. E B C D A 练习Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd. 在阳光下,身高为1.68m的小强在地面上的 影长是2m,在同一时刻,
