如图,两建筑物的水平距离BC为18m,从A点测得D点的俯角
为 30,测得C点的俯角
为 60° ,求建筑物CD的高度(结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225370138001408/2228866843787264/STEM/49b6c5d0-3079-4bd4-9efd-2f1d27ededb0.png)
更新时间:2019-06-19 11:04:06
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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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解答题-问答题
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适中
(0.65)
【推荐1】2020年11月24日4时30分,我国在中国文昌航天发射场,用长征五号遥五运载火箭成功发射探月工程嫦娥五号探测器,顺利将探测器送入预定轨道,开启我国首次地外天体采样返回之旅.如图,当火箭达到A点时,从位于地面C处雷达站测得AC的距离是6km仰角为
;1秒后火箭到达B点,此时测得仰角为
.求这枚火箭从A到B的平均速度是多少?(结果精确到0.01)(参考数据
,
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ca369b593612f79fb9ff144c60f37f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e2e0ff462c71046702f9fa772e336b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3515f7a32f53800399e5582252099c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4aa780f6a04722ed38ed7cddefc715d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45bcd8f6ede8cc2513ad41402f40086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b182523f13fa739a2a9f2bacff4bb054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1045d2bd8174a814c1ea2d490cb931d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc933d2600e28327f69d8d10942cd387.png)
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解答题-应用题
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适中
(0.65)
名校
【推荐2】某校组织九年级学生到三台山森林公园游玩,数学兴趣小组同学想利用测角仪测量天和塔的高度.如图,塔
前有一座高为
的斜坡,已知
,
,点E、C、A在同一条水平直线上.某学习小组在斜坡C处测得塔顶部B的仰角为45°,在斜坡D处测得塔顶部B的仰角为39°.
的长;
(2)求塔
的高度.(
取0.8,
取1.7,
取1.4,结果取整数)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a88aefea5d81c3b202df352b0b677d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdebc1592efdbdf58b9b0dd9ee725c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求塔
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50e663295e745b50e920ddc1425314f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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