如图,把一根4.5米长的竹竿斜靠在石坝旁,量出竿长1米时它离地面的高度是0.6米,又量得竿顶与坝脚的距离BC=2.8米,∠CBF记作α,下列式子正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/3e9dd7c1-c087-44a6-b7cd-d4c1609ddde7.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/9/3e9dd7c1-c087-44a6-b7cd-d4c1609ddde7.png?resizew=192)
A.sinα=![]() | B.cosα=![]() | C.sinα=![]() | D.tanα=![]() |
更新时间:2021-05-08 11:30:29
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【知识点】 仰角俯角问题(解直角三角形的应用)
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图,为了测量某风景区内一座凉亭AB的高度,小亮分别在凉亭对面的高台CD的底部C和顶部D处分别测得凉亭顶部A的仰角为45°和30°,已知高台CD为2m,则凉亭AB的高度为( )(结果保留一位小数,
)
![](https://img.xkw.com/dksih/QBM/2021/3/20/2681923730604032/2682567648444416/STEM/b64e7e93-ac15-48cc-8eca-1a3e8180adff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://img.xkw.com/dksih/QBM/2021/3/20/2681923730604032/2682567648444416/STEM/b64e7e93-ac15-48cc-8eca-1a3e8180adff.png)
A.4.7m | B.4.8m | C.8.1m | D.8.2m |
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单选题
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适中
(0.65)
【推荐2】如图,小明为了测量照母山上“览星塔”
的高度,先从与塔底中心
在同一水平面上的点
出发,沿着坡度为
的斜坡
行走10米至坡顶
处,再从
处沿水平方向继续前行若干米后至点
处,在
点测得塔顶
的仰角为
,塔底
的俯角为
,
与
的水平距离为4米(图中
、
、
、
、
、
在同一平面内,
、
和
、
、
分别在同一水平线上),根据小明的测量数据,计算出“览星塔”
的高度约为(计算结果精确到0.1米,参考数据:
,
,
)( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/84e7d48c-7e82-41b4-8e38-3d1803080ac1.png?resizew=252)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.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/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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e15359371f06709efb628143fccf02f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55315e2bb934c29dda1a66c094617f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f1786ccc3b2b6f9aed4a5c55a0c2eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/84e7d48c-7e82-41b4-8e38-3d1803080ac1.png?resizew=252)
A.17.8米 | B.23.7米 | C.31.5米 | D.37.4米 |
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