第1章 解三角形
正弦定理、余弦定理应用(重点)
一、选择题:在每小题给出的四个选项中,只有一项是符合题目要求的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
A.![]() | B.![]() | C.0 | D.![]() |
【知识点】 余弦定理边角互化的应用解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303706f2764f1faaa2b278536e94fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf129eef44c8b71fb536578ae5c2cbf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d85d31ddb1b80a159c3e825c0205542f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93b074026051d70ac31cd2af1af3022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fdfc856e4c80a7995957ef4845346f4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 用和、差角的正切公式化简、求值解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/b467fd53-764e-4187-b271-e783e80139b2.png?resizew=149)
A.200米 | B.110米 | C.120米 | D.130米 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4065d41c51bee68d1adf48011ca02bf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb72ec0719d0390eacab884add54ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d65224f8cfd2d8f8403f13076aee9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/23/8b1af8d7-fc8c-46f4-a1a7-c0e02790cee0.jpg?resizew=121)
A.![]() | B.4 | C.![]() | D.![]() |
【知识点】 求三角形中的边长或周长的最值或范围解读
二、填空题
【知识点】 三角形面积公式及其应用解读 余弦定理解三角形解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
三、解答题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386085321b6f5d61da1c086f88c98c71.png)
(1)求角B的大小;
(2)若a=1,b2=ac,求△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c65bea2c80af038768b74250c694e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71812e0762c0aaffb51cfef66156567.png)
(1)求角B、C;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
【知识点】 正弦定理解三角形解读 三角形面积公式及其应用解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94507394a55f53494bf44d5116f7a198.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)