题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105040-71635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105041-14852.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105041-17336.png)
解析
试题分析:过B作
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105041-22701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-96912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-78980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-24590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-95421.png)
过B作
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105041-22701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-96912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105043-82110.png)
∵AB的坡度
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105043-92906.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105043-87921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105044-64981.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-78980.png)
∵AB=10,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105044-33439.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105044-65578.png)
在Rt△BCF中,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-24590.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105044-11042.png)
在Rt△ADE中,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105042-95421.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105045-18109.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105045-52140.png)
∴CD=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105041-17336.png)
点评:解题的关键是读懂题意及图形,正确作出辅助线,构造直角三角形解题.
核心考点
试题【如图,某校一幢教学大楼的顶部竖有一块“传承文明,启智求真”的宣传牌CD.小明在山坡的坡脚A处测得宣传牌底部D的仰角为60°,沿山坡向上走到B处测得宣传牌顶部C的】;主要考察你对解三角形等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105036-38902.png)
(2)已知sinα·cos30°=
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105037-73967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105029-38056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105030-86390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105030-91625.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105024-20011.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105016-50645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105016-92529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105017-96281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105017-94720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105017-16377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105017-76323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105018-96240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105018-19773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105008-11896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105008-87628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105009-62063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105009-29038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104105010-19082.png)
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