某镇为创建特色小镇,助力乡村振兴,决定在辖区的一条河上修建一座步行观光桥,如图,该河旁有一座小山,山高
,坡面AB的坡度
(注:从山顶B处测得河岸E和对岸F的俯角分别为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/4454a6ae-3298-449c-bd99-87cd62348d9a.png?resizew=385)
(1)求山脚A到河岸E的距离;
(2)若在此处建桥,试求河宽EF的长度.(结果精确到0.1m)
(参考数据:
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8250f97ba4d6a07c1ec1c07cd577103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/747eb50be46bd9892f6fd2d39907a6e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30542b942e3bcbcff9b9fcf75a2b5366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297ef98dec3515eb432ebd8758cb4e76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/4454a6ae-3298-449c-bd99-87cd62348d9a.png?resizew=385)
(1)求山脚A到河岸E的距离;
(2)若在此处建桥,试求河宽EF的长度.(结果精确到0.1m)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b659daf103d2d3f906c274a2532e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41385beeda899e295ae092fa47ec8a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d249aadf01efdd3dbc712ef5f58348.png)
更新时间:2022-08-13 22:15:31
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【知识点】 图形的性质
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