如图所示,小明家与小华家住在同一栋楼的同一单元,他俩想测算所住楼对面商业大厦的高MN.他俩在小明家的窗台B处,测得商业大厦顶部N的仰角∠1的度数,由于楼下植物的遮挡,不能在B处测得商业大厦底部M的俯角的度数.于是,他俩上楼来到小华家,在窗台C处测得大厦底部M的俯角∠2的度数,竟然发现∠1与∠2恰好相等.已知A,B,C三点共线,CA⊥AM,NM⊥AM,AB=31m,BC=18m,试求商业大厦的高MN.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/28/6d703a92-7872-4075-afe7-f133d0ffc31b.png?resizew=139)
2020·陕西·中考真题 查看更多[7]
陕西省2020年中考数学试题(已下线)非选择题专练05 简单几何证明与运用—2021年《三步冲刺中考·数学》(广东专版)之第2步大题夺高分(已下线)非选择题专练07 解三角形—2021年《三步冲刺中考·数学》(全国通用)之第2步大题夺高分 (已下线)必刷卷05-2021年中考数学考前信息必刷卷(河南专用)2022年江苏省无锡市江阴市敔山湾实验学校中考数学一模试题四川省广安市岳池县2022-2023学年八年级上学期期中数学试题山东省德州市武城县武城镇吕庄中学2023-2024学年九年级上学期第二次月考数学试题
更新时间:2020-07-24 12:55:58
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【推荐1】如图①,在△ABC中,AC=BC,点D为BC的中点,DE⊥AB,垂足为点E,过点B作BG∥AC交DE的延长线于点G.
![](https://img.xkw.com/dksih/QBM/2017/2/16/1625271584612352/1643690324918272/STEM/10b7e50f6e4e409bbce1c5314d63e74c.png?resizew=344)
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![](https://img.xkw.com/dksih/QBM/2017/2/16/1625271584612352/1643690324918272/STEM/10b7e50f6e4e409bbce1c5314d63e74c.png?resizew=344)
(1)求证:DB=BG;
(2)当∠ACB=90°时,如图②,连接AD、CG,求证:AD⊥CG.
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【推荐2】如图1,
中,
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、
相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/27/0a05174a-b3ca-4814-97cc-7756126d4e1d.png?resizew=296)
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;
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐1】如图是斜坡
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【推荐2】如图,平行四边形
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