永丰文塔位于湖南省双峰县城永丰镇,修建于清朝同治年间,巍巍七层文塔,塔形呈六角形,塔底用高达五尺八寸的青条石奠基,永丰文塔与双峰书院遥相呼应,象征双峰文运昌隆.如图,某测绘小组为了测量永丰文塔的实际高度
,选取了与塔底
在同一水平面内的两个测量基点
,现测得
,在点
测得塔顶A的仰角为
,则塔高
( )(取
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-05-25 12:46:40
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【推荐1】在
中,内角
,
,
的对边分别为
,
,
,若
,则
等于( )
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A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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【推荐2】已知
的三边
,
,
构成等差数列,且最大内角是最小内角的2倍,则最小内角的余弦值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】二七罢工纪念塔位于郑州市二七广场,是为纪念京汉铁路工人大罢工中牺牲的烈士,发扬“二七”革命传统文化精神而修建的纪念性建筑物.某校为庆祝建党
周年,组织学生参观二七罢工纪念塔.同学们在参观过程中,对纪念塔的塔高产生了兴趣,为测量塔的高度,甲同学在二七广场
地测得纪念塔顶端
仰角为
,乙同学在二七广场
地测得纪念塔顶端
的仰角为
,塔底为
(
,
,
在同一水平面上,
平面
),量得
米,
,则纪念塔的高
( )
![](https://img.xkw.com/dksih/QBM/2021/10/20/2833274727325696/2833300882989056/STEM/8cfc158b-1ae4-4bfa-a6c2-9adcae057199.png?resizew=158)
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【推荐2】“故人西辞黄鹤楼,烟花三月下扬州”出自唐朝诗人李白的《黄鹤楼送孟浩然之广陵》,黄鹤楼位于今湖北武汉市,自古享有“天下江山第一楼”之称.下面是黄鹤楼的示意图,某位游客(身高忽略不计)从地面
点看楼顶点
的仰角为30°,沿直线前进37.5米到达
点,此时看楼顶点
的仰角为45°,则楼高
约为( )(参考数据:
)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/97c7534a-77a8-4921-94f9-7770b6433a26.png?resizew=166)
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A.45米 | B.51米 | C.62米 | D.73米 |
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