在
中,已知
,解这个三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d37e97a9bd2d88fcb04108b1564b655.png)
23-24高一下·上海·假期作业 查看更多[1]
(已下线)专题09正弦定理-【寒假自学课】(沪教版2020)
更新时间:2024-01-21 20:06:48
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解答题-问答题
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(0.85)
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【推荐1】已知
是锐角三角形,向量
,且
.
(1)求
的值;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6774d68a27a0872558dc3fcda78b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a90f98bccbc52762348a55d007b851f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b819030450950f01d537559f37cf7e1d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a56119714123fd29d3455d600e752281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
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较易
(0.85)
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【推荐2】如图在平面四边形ABCD中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/7e8b9812-ca26-42ea-8542-03490b1535d3.png?resizew=139)
(1)求边BC;
(2)若
,求四边形ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e39bee1445161f91213c83b498b8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c9491f900cc3cd4a80bd259c4717fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ba7ace6dc5b3f26ea674f64247484e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/7e8b9812-ca26-42ea-8542-03490b1535d3.png?resizew=139)
(1)求边BC;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48e9140641e0195d64927dd3f23e7624.png)
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