如图所示,为了测量河对岸A,B两点间的距离,在这一岸定一基线CD,现已测出
和
,
,
,
,则AB的长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9979e5f429dbbfb3801b10163125108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c0d4b9e6102dbd4001f513c3841b56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217ff00e6d76918adc208575fd8e6611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c602e9e5f555a02ca978b333adb3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180250115edeb277c9b4843c60a78be6.png)
![](https://img.xkw.com/dksih/QBM/2019/4/11/2180086947323904/2180873518702592/STEM/4e2dcee9f47c4aebb59da560faaa4efe.png?resizew=130)
更新时间:2016-11-30 09:08:08
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【推荐1】江岸边有一炮台高30m,江中有两条船,船与炮台底部在同一水面上,由炮台顶部测得俯角分别为45°和60°,而且两条船与炮台底部连线成30°角,则两条船相距________ m.
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【推荐2】如图,甲船在A处,乙船在甲船正南方向距甲船
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