为了测量山坡上的电线杆PQ的高度,某数学活动小组的同学们带上自制的测倾器和皮尺来到山脚下,他们在A处测得信号塔顶端P的仰角是45°,信号塔底端点Q的仰角为30°,沿水平地面向前走100米到B处,测得信号塔顶端P的仰角是60°,求信号塔PQ得高度.
![](https://img.xkw.com/dksih/QBM/2020/8/15/2528592060792832/2530608014712832/STEM/ab7897edd1f04579a50171e391a46409.png?resizew=132)
更新时间:2020-08-18 18:38:05
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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1】某地为打造宜游环境,对旅游道路进行改造.如图是风景秀美的观景山,从山脚B到山腰D沿斜坡已建成步行道,为方便游客登顶观景,欲从D到A修建电动扶梯,经测量,山高AC=154米,步行道BD=168米,∠DBC=30°,在D处测得山顶A的仰角为45°.求电动扶梯DA的长(结果保留根号).
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【推荐2】新建成的海天中心主楼堪称“青岛第一高楼”,成为青岛地标性建筑之一,如图为了测量海天中心主楼
的高度,某数学实践小组在
处测得楼顶
的仰角为
,仪器
高度为
米,将仪器
沿着
方向前进
米到达
,在
处测得楼顶
的仰角为
,请计算海天中心主楼
的高度.(
,
,
,
)
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