名校
解题方法
1 . 三角测量法是在地面上选定一系列的点,并构成相互连接的三角形,由已知的点观察各方向的水平角,再测定起始边长,以此边长为基线,即可推算各点坐标的一种测量方法.在实际测量中遇到障碍,无法得到平距的测量都需要用到三角测量法.如图,为测量横截面为直角三角形的某模型的平面图
,其中角ACB为直角,由于实际情况,它的边和角无法测量,以下为可测量数据:①
;②
;③
.请根据以上数据求出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edeeec35921747c6f9f5aed1a7b9932.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8588d9543f05208d26b33becfe0073fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/f5d35fc6-cefb-4960-b9f5-8df65a2d6350.png?resizew=212)
您最近一年使用:0次
2022-06-13更新
|
463次组卷
|
4卷引用:山东省济南市2021-2022学年高一下学期5月联合考试A卷数学试题
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