在一次综合实践活动中,小明要测某地一棵椰树AE的高度.如图,已知椰树离地面4m有一点B,他在C处测得点B的仰角为30°,然后沿AC方向走5m到达D点,又测得树顶E的仰角为50°.
(1)求AC的距离;(结果保留根号);
(2)求塔高AE.(结果取整数).
(参考数据:sin50°≈0.77,cos50°≈0.64,tan50°≈1.20,
≈1.73)
(1)求AC的距离;(结果保留根号);
(2)求塔高AE.(结果取整数).
(参考数据:sin50°≈0.77,cos50°≈0.64,tan50°≈1.20,
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245384945664/1574245391548416/STEM/4bd32c26359a4558a2e1b46af391aa5c.png)
![](https://img.xkw.com/dksih/QBM/2016/9/29/1574245384945664/1574245391548416/STEM/d3a1ef2d1c16439cb7f7b50733b1fe39.png)
2016·海南·一模 查看更多[1]
更新时间:2016-12-06 13:53:21
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【知识点】 仰角俯角问题(解直角三角形的应用)
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【推荐2】如图,为测量某建筑物的高度,某人在点
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处,测得建筑物顶端
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