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
,沿水平地面前进30米到达B处,测得大树顶端D的仰角
,测得山坡坡角
(图中各点均在同一平面内).则这棵大树
的高度为______________ .(结果取整数,参考数据:
,
,
,
)
![](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/4291de543d7ac195df8f2d0bfed0ecbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c619b5974c20c5b590bbb8720defd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff2db683bbe08dd531035d63560f7bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76fe9cc87f8e8389c94efa7e7caab2a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad548d3bb499aab6d0baf4032be99bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664a5f9b61fd010eda340986ca34b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/7c914d3c-f7ae-4dbc-8f71-2fbe6abe4e18.png?resizew=396)
更新时间:2023-04-30 20:57:57
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