某校数学小组拟测量学校新建实验楼的高度
,测量方案如下:如图所示,首先,测量者在C处放置一平面镜,从点C沿
后退,当退行
米到E处时,恰好在镜子中看到实验楼顶A的像,此时测量者眼睛到地面的距离
为
米;然后,沿
的延长线继续后退到点G,用高度为
米的测角仪测得实验楼的顶端A的仰角为
,已知
米,点B,C,E,G在同一水平直线上,且
,
,
均垂直于
,求实验楼的高度
.(结果精确到0.1,参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0062f4f00732a0cf11d1ac145c218b.png)
更新时间:2024-05-26 19:13:46
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【推荐1】如图所示:笔直的公路边有甲、乙两栋楼房,高度分别为
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【推荐2】学完了《图形的相似》这一章后,某中学数学实践小组决定利用所学知识去测量一古建筑
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上取
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为
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后退
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后退
到
处,从
处观察
点,
三点也成一线.请根据以上测量数据,帮助实践小组求出该古建筑的高度.
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【推荐1】如图,五泉山的两个景点
、
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的俯角为
,测得
、
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、
之间的距离.(结果保留整数,参考数据:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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【推荐2】邵阳市某校吴老师组织九(1)班同学开展数学活动,带领同学们测量学校附近一电线杆的高.已知电线杆直立于地面上,某天在太阳光的照射下,电线杆的影子(折线BCD)恰好落在水平地面和斜坡上,在D处测得电线杆顶端A的仰角为30°,在C处测得电线杆顶端A得仰角为45°,斜坡与地面成60°角,CD=4m,请你根据这些数据求电线杆的高(AB).
(结果精确到1m,参考数据:
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≈1.7)
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