如图,为了估算河的宽度,我们可以在河对岸选定一个目标点
,再在河岸的这一边选取点
和点
,使
,然后再选取点
,使
,用视线确定
和
的交点
,此时如果测得
,
,
,求
、
间的大致距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5034a973110e2a6eb2e7d5699c24f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34b88bcecbba6769d820bf81ee450ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03273a0571358c14d99c840fdab75984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983f9113070b115278cbb2fc432a9aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d81df42ec3b06bc6583e510437228f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084766984511488/2136400173940736/STEM/94748e06395e43fca544b3d93088d5d0.png?resizew=121)
更新时间:2019-02-08 19:40:11
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相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】为了估计河的宽度,我们可以在河对岸的岸边选定一个目标记为点A,再在河的这一边选点B和点C,使得
,设
与
交于点D,如图所示测得
,那么这条河的大致宽度是多少米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aeba6c2e571cc5b3ee0bd6478a82277.png)
![](https://img.xkw.com/dksih/QBM/2021/11/30/2862380148916224/2922726712549376/STEM/2a32f45a-e864-4319-b8bd-1183c0e3e5b8.png?resizew=262)
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解答题-计算题
|
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(0.85)
【推荐2】下表是小明填写的综合实践活动报告的部分内容,请你借助小明的测量数据,计算河流的宽度
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
题目 | 测量河流宽度 |
目标示意图 | |
测量数据 |
|
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