如图所示,电视塔由信号发射塔
和主楼
两部分组成.某校九年级数学社团利用元旦假期进行校外实践活动,他们选定点
为观测点,测得
,信号发射塔顶
的仰角为
,发射塔底
的仰角为
.请你帮他们求出信号发射塔
的高度(结果精确到
.参考数据:
,
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce875bd709ecc40a050514dda531190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/db8f23aea123f92654dd0d19aa5f98ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaa19eeaf415ed419e77fe92794f443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0321d1fc9281b170222267aba1f67cde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15d51ebae587c7731f394d8c10bea8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/538c1182a6af5e9a75f63b970906218e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/f4585bfc-0009-4763-9bcd-82ebe9c5a2fb.png?resizew=205)
更新时间:2022-08-02 10:57:07
|
【知识点】 仰角俯角问题(解直角三角形的应用)
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】已知电视发射塔BC,为稳固塔身,周围拉有钢丝地锚线(如图线段AB),若AB=60m,并且AB与地面成45°角,欲升高发射塔的高度到CB′,同时原地锚线仍使用,若塔升高后使地锚线与地面成60°角,求电视发射塔升高了多少米?(即BB′的高度)
![](https://img.xkw.com/dksih/QBM/2020/3/21/2424495270068224/2425236278403072/STEM/9e3217a1-44a2-42e8-92fd-7057264b933e.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】为了预防近视,要求学生写字姿势应保持“一尺、一拳、一寸”,即眼睛与书本距离约为一尺(约
),胸前与课桌距离约为一拳,握笔的手指与笔尖距离约为一寸. 如图,
为桌面,某同学眼睛
看作业本
的俯角为
为身体离书桌距离
,眼睛到桌面的距离
.
(2)为确保符合要求,需将作业本沿
方向移动.当眼睛
看作业本
的俯角为
时,求作业本移动的距离.(
,
. 结果精确到0.1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26c44273c9e0b23206cac5595d9adf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e84a0ffe9820a2551409670f0540c9f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6db58f1912fc3fb507438cdd6351e5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33825977bc3d3776cbf39c9eefbacb51.png)
(2)为确保符合要求,需将作业本沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b8f224ab776923c7f423796788dd9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40cf45c5d4c08ec6b5363573eb52af03.png)
您最近一年使用:0次