已知
的内角A,B,C所对应的边分别为a,b,c,且满足 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6598db3127fb1922ff2cc134b4f45176.png)
(1)求角C的大小;
(2)若
,点D为AB 的中点,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6598db3127fb1922ff2cc134b4f45176.png)
(1)求角C的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20e1c681b27df538bd4742f6cd8298ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c96d049465a04bb9d09f97c0d33f7f1.png)
23-24高三上·重庆·阶段练习 查看更多[2]
更新时间:2023-12-16 18:10:30
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【推荐2】如图,某企业的两座建筑物AB,CD的高度分别为20m和40m,其底部BD之间距离为20m.为响应创建文明城市号召,进行亮化改造,现欲在建筑物AB的顶部A处安装一投影设备,投影到建筑物CD上形成投影幕墙,既达到亮化目的又可以进行广告宣传.已知投影设备的投影张角∠EAF为
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(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dde1247e84284497b0791cb4acbb576.png)
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