名校
1 . 在
中,内角
,
,
所对的边分别是
,
,
,若
,
,则
的面积为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1accf79f9068bb5c931f1eacd9a6a1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3卷引用:四川省自贡市2020-2021学年高一下学期期末数学(理)试题
2 . 在
中,内角
,
,
所对的边分别是
,
,
,若
,
,则
的面积为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1accf79f9068bb5c931f1eacd9a6a1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.4 | C.![]() | D.![]() |
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名校
解题方法
3 . 在
中,已知
,且
,则
的形状是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8cc99ff0057273debaf2512fbafd39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93978a8510b14104b3260c557bdd0502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.等腰三角形 | B.等腰直角三角形 |
C.直角三角形 | D.等边三角形 |
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8卷引用:四川省广安市2020-2021学年高一下学期期末数学试题
四川省广安市2020-2021学年高一下学期期末数学试题四川省眉山市彭山区第一中学2021-2022学年高二上学期入学考试数学试题河南省濮阳市油田第二高级中学2021-2022学年高二上学期9月考试文科数学试题四川省射洪中学校2022-2023学年高二上学期入学考试数学试题四川省资中县第二中学2022-2023学年高二上学期开学考试理科数学试题(已下线)考点15 正、余弦定理及解三角形-备战2022年高考数学一轮复习考点帮(浙江专用)(已下线)第五篇 向量与几何 专题14 三角形射影定理 微点2 三角形射影定理(二)(已下线)9.1.1正弦定理-同步精品课堂(人教B版2019必修第四册)
4 . 在锐角
中,
,
为
边上的一点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/3def55ad-7492-41b1-a795-2e3ba96a123d.png?resizew=153)
(1)求
的大小;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c14a66ed4bd66df65bc42c4ac1ed15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d4746df85049d1651d3f6c30212a7a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/3def55ad-7492-41b1-a795-2e3ba96a123d.png?resizew=153)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29470a095de205acb450d5a48b38be1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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3卷引用:四川省自贡市2020-2021学年高一下学期期末考试数学(文)试题
四川省自贡市2020-2021学年高一下学期期末考试数学(文)试题四川省自贡市2020-2021学年高一下学期期末数学(理)试题(已下线)6.4.3 余弦定理、 正弦定理 第2课时 正弦定理(分层作业)-【上好课】
名校
5 . 如图,从气球
上测得正前方的河流的两岸
,
的俯角分别为
,
,此时气球的高是
,则河流的宽度
约等于______ m.(用四舍五入法将结果精确到个位.参考数据:
,
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da85a7f673ef57492ce28e1027b8599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb79aaff861629f5990a79ace8b5806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55ee487ed48cd9dd0b0eb78e7a6613f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cb5697fed1e97d0e017c22e4892071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0f9b301733b4aaa18d17d7a9b50212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eef2e8da761202f5cc9b0aecb1828f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
![](https://img.xkw.com/dksih/QBM/2021/7/7/2759222434103296/2778908041994240/STEM/522cc26a-2701-4c1d-8880-4c2106961a74.png?resizew=272)
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3卷引用:四川省自贡市2020-2021学年高一下学期期末考试数学(文)试题
6 . 已知
的三边长为
,
,
,若满足
,则角
大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e58ff373a852c9c3e3a00d21483362e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2卷引用:四川省自贡市2020-2021学年高一下学期期末考试数学(文)试题
解题方法
7 . 如图,在平面五边形
中,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760651331125248/2778309296865280/STEM/140903369a7f4c31bf2fd888c91921e8.png?resizew=178)
(1)求
的值;
(2)求
的取值范围
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9100eadeba8de498bad6bc9189433d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b755ee4dda4a72063c6fba125720a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2971f739c3762cc3dff09242516c1c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7757dac3098323183ed3f8c98c6244.png)
![](https://img.xkw.com/dksih/QBM/2021/7/9/2760651331125248/2778309296865280/STEM/140903369a7f4c31bf2fd888c91921e8.png?resizew=178)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7b02542c53b467d51c9a07ea6fb1d4.png)
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名校
解题方法
8 . 在
中,内角
的对边分别为
且
.
(1)求角
的大小;
(2)若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7132c2d8b2ff504e6c2ba36c4f6dcfaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdbbaf8105883cac72ae3683b1f7658.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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|
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2卷引用:四川省资阳市2020-2021学年高一下学期期末数学试题
名校
解题方法
9 . 在
,角
,
,
的对边分别为
,
,
,向量
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dab8159361684d8c22b7bc7c18c33f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce8a67b0744adb9f54b5840d8732540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fad701b811a3dbbd72dca7ed887698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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|
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3卷引用:四川省资阳市2020-2021学年高一下学期期末数学试题
名校
10 . 在
中,角
、
、
所对的边分别为
、
、
,若
,
,则当角
取得最大值时,
在
方向上的投影是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246305a1fab6d08c03984a273e127684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecf0e738c92c9a6d20d274398e137b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a1b3d5f4068fbcba6e4b47971d51a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305d5f36a9fdbc840161b36563923195.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2卷引用:四川省内江市2020-2021学年高一下学期期末数学试题