数学活动小组欲测量山坡上一棵大树
的高度,如图,
于点E,在A处测得大树底端C的仰角为
,沿水平地面前进
米到达B处,测得大树顶端D的仰角为
,测得山坡坡角
(图中各点均在同一平面内).(参考数据:
,
,
)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/8aeeaad0-76b6-4374-97b2-44efb8fecdb3.png?resizew=219)
(1)求斜坡
的长,水平宽度
长度;
(2)求这棵大树
的高度(结果保留根号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b468f211ae984945b3edd45391c0b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2e986ab060b34a9b7a10c07a148d2b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c619b5974c20c5b590bbb8720defd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc81089ce42da9caca24018a3ed425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28fb9158d8c64e30195dfacadb28013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad548d3bb499aab6d0baf4032be99bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/8aeeaad0-76b6-4374-97b2-44efb8fecdb3.png?resizew=219)
(1)求斜坡
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)求这棵大树
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2023-05-11 21:29:58
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【推荐2】如图①,已知直线l1、l2,直线l3和直线l1、l2交于点C和D,在直线l3上有动点P(点P与点C、D不重合),点A在直线l1上,点B在直线l2上.
(1)如果点P在C、D之间运动时,且满足∠1+∠3=∠2,请写出l1与l2之间的位置关系 ;
(2)如图②如果l1∥l2,点P在直线l1的上方运动时,试猜想∠1+∠2与∠3之间关系并给予证明;
(3)如果l1∥l2,点P在直线l2的下方运动时,请直接写出∠PAC、∠PBD、∠APB之间的关系.
(1)如果点P在C、D之间运动时,且满足∠1+∠3=∠2,请写出l1与l2之间的位置关系 ;
(2)如图②如果l1∥l2,点P在直线l1的上方运动时,试猜想∠1+∠2与∠3之间关系并给予证明;
(3)如果l1∥l2,点P在直线l2的下方运动时,请直接写出∠PAC、∠PBD、∠APB之间的关系.
![](https://img.xkw.com/dksih/QBM/2019/7/4/2239172040122368/2239749041348608/STEM/987195270b244c13ac6de0c2462d0de0.png?resizew=299)
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【推荐1】如图,在
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和
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的中点,连接
,交
于点G,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0984b61376dd0ea6e2cd42751eab437a.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/7/5e76c865-4388-4710-9533-d0244636ca8f.png?resizew=215)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/9fd4a1fa-eac5-4abd-98dd-42050de24f93.png?resizew=364)
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