1 . 如图所示,在河对岸有两座垂直于地面的高塔
和
.张明在只有量角器(可以测量从测量人出发的两条射线的夹角)和直尺(可测量步行可抵达的两点之间的直线距离)的条件下,为了计算塔
的高度,他在点A测得点
的仰角为
,
,又选择了相距100米的
点,测得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/239a24e7-8ffe-44a1-a1c5-02be15106643.png?resizew=168)
(1)请你根据张明的测量数据求出塔
高度;
(2)在完成(1)的任务后,张明测得
,并且又选择性地测量了两个角的大小(设为
、
).据此,他计算出了两塔顶之间的距离
.
请问:①张明又测量了哪两个角?(写出一种测量方案即可)
②他是如何用
表示出
的?(写出过程和结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a439c8ebe2f8f158683b51919644ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/239a24e7-8ffe-44a1-a1c5-02be15106643.png?resizew=168)
(1)请你根据张明的测量数据求出塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在完成(1)的任务后,张明测得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7bd60a2972e9dd5e3ba90d6b2639586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
请问:①张明又测量了哪两个角?(写出一种测量方案即可)
②他是如何用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
您最近一年使用:0次
2020·全国·模拟预测
2 . 秦九韶在《数书九章》中提及了山高的测量方法:如图,已知树高
米,距山
米,人(人站在坡面上)在距树
米处望山,人目
、树顶
、山顶
在一条直线上,根据图可得
,得
,即可求出山高.此方法为我们提供了一种人在山坡上任选一点测量山高的方法,若
,
,
,
,则目高
( )(山高为
,目高
为眼睛到山脚的重直距离)
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634695124287488/2635389340622848/STEM/5a76a197-9116-4ce3-859f-b8262c9a36a9.png?resizew=313)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/193e7005c259d6e89e5bcce71ffea772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14c9ae7784e1e62d8135c84bd3d2e368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86718fa3bd81961f00798692fbf86db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ced0786c01314bbb90a24cb900492f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f642cfbe71ace1a1c439dafa2b82dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5e7d9414ee7412c4888ff30384e48d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2021/1/12/2634695124287488/2635389340622848/STEM/5a76a197-9116-4ce3-859f-b8262c9a36a9.png?resizew=313)
A.4.91米 | B.3.91米 | C.2.91米 | D.1.91米 |
您最近一年使用:0次