如图,已知斜坡
长为
米,坡角(即
)为
,
,现计划在斜坡中点
处挖去部分坡体(用阴影表示),修建一个平行于水平线
的平台
和一条新的斜坡
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/175fcf7e-96ae-43d8-a3a6-1e2ff079de1b.png?resizew=194)
(1)若修建的斜坡
的坡角为
,求平台
的长;(结果保留根号)
(2)一座建筑物
距离
处
米远(即
为
米),小明在
处测得建筑物顶部
的仰角(即
)为
,点
在同一个平面内,点
在同一条直线上,且
,求建筑物
的高度.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900531973c546625694146fa1509ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/175fcf7e-96ae-43d8-a3a6-1e2ff079de1b.png?resizew=194)
(1)若修建的斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)一座建筑物
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3783ab9d207fc2a4741be4f064440f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eef67926d6244187cd9105dd45aa87c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4531443ebdfaded214cd3ffd11a69d4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfb4bbc890fa27776e52f274976c604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
更新时间:2024-02-26 17:39:20
|
相似题推荐
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在菱形
中,对角线
、
相交于点O.
的延长线上截取
,连接
,再过点B作
的垂线交
于点F(保留作图痕迹,不写作法);
(2)求证:四边形
为矩形.
证明:∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
∴ ①
∵四边形
是菱形
∴
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
∴ ②
又∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴四边形
为平行四边形
∴ ③
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32df2531186d1c2c3186159cc75f1c5.png)
∴ ④
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb01e74951842c405251b5bf98b92f4.png)
∴四边形
为矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47e44229585c09a3eec68277369beb8.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
∴ ①
∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1ac3ab8d3ce5e61fd2f89761f80976.png)
∴ ②
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945e93c9f3515ded840de09a9ba81ce8.png)
∴ ③
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32df2531186d1c2c3186159cc75f1c5.png)
∴ ④
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb01e74951842c405251b5bf98b92f4.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b47e44229585c09a3eec68277369beb8.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,
,
是
的中点,
是线段
延长线上一动点,过点
作
,与线段
的延长线交于点
,连接
、
.
是平行四边形;
(2)若四边形
是矩形,
,
,求
的值;
(3)若
,试判断四边形
是什么样的四边形,并证明你的结论.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e64f1d9d1dfa1cb58eba4218745373a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
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(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7efc841d4bd475c8f9f8ce2d682d783b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐1】如图,小王站在河岸上的G点,看见河里有一小船垂直于岸边的方向划过来.此时,测得小船C的俯角是∠FDC=30°,若小王的眼睛与地面的距离是1.6米,BG=1米,BG平行于AC所在的直线,迎水坡i=4:3,坡长AB=10米,点A、B、C、D、F、G在同一平面内,求小船C到岸边的距离CA的长.(结果保留根号)
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解答题-问答题
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(0.65)
真题
【推荐2】小明在热气球A上看到正前方横跨河流两岸的大桥BC,并测得B,C两点的俯角分别为45°和35°,已知大桥BC与地面在同一水平面上,其长度为100m.请求出热气球离地面的高度.(结果保留整数,参考数据:
,
,![](https://img.xkw.com/dksih/QBM/2015/7/2/1573860949073920/1573860955488256/STEM/ad9d3e5ba0414f6fbd500aad5921919f.png)
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解答题-问答题
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【推荐1】下图为某单位地下停车库入口处的平面示意图,如图,在司机开车经过坡面即将进入车库时,在车库入口CD的上方BC处会看到一个醒目的限高标志,现已知图中BC高度为0.5m,AB宽度为9m,坡面的坡角为30°.
(1)根据图(1)求出入口处顶点C到坡面的垂直高度CD
(2)图(2)中,线段CE为顶点C到坡面AD的垂直距离,现已知某货车高度为3.9米,请判断该车能否进入该车库停车?(
,精确到0.1米)
(1)根据图(1)求出入口处顶点C到坡面的垂直高度CD
(2)图(2)中,线段CE为顶点C到坡面AD的垂直距离,现已知某货车高度为3.9米,请判断该车能否进入该车库停车?(
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解答题-问答题
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【推荐2】如图是某货站传送货物的平面示意图,为了提高传送过程的安全性,工人师傅欲减小传送带与地面的夹角,使其由
改为
.已知原传送带
长为
.
(1)求新传送带
的长度;
(2)如果需要在货物着地点
的左侧留出
的通道,试判断距离
点
的货物
是否需要挪走,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102dba148ec4c1a8c058b9a41b4d96aa.png)
(1)求新传送带
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如果需要在货物着地点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09905ffb3a353e3051b16bd6b72b237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b74adf8e76d80086d585c4d35ba08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db492efc6bfe199d47633e6d5946ad57.png)
![](https://img.xkw.com/dksih/QBM/2021/1/25/2645177460957184/2666269253558272/STEM/9b49af64-c0a3-494d-b1e7-4fd3c9fc7adc.png)
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