名校
1 . 若
的三个内角
,
,
,且面积
,则该三角形的外接圆半径是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54a36173cd9b7b28e91619d715cb569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56364675e1e3f46e61bc145d7123cd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b903021571c1b57943a1a3274217654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7da880f223ab3ecd4f351d5ee627cfb0.png)
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2 . 某公园现利用改地建设两块三角形花圃ABD与BCD,如图所示,其中
米,
米,
,且
.
![](https://img.xkw.com/dksih/QBM/2019/12/31/2367119581929472/2367691122499584/STEM/3e6a123b6ab04bd6932f9bd1b46e1916.png?resizew=148)
(1)若
,求
的大小;(精到
)
(2)当
为何值时,两块花圃的总面积最大?并求出此最大值.(精确到1平方米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efcb5be5033e9bd4c2f58798a651e3f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbb91d806e628cf978557ffad6a7020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/856ec5e63ddd1398e67eaebfa55044fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a168e1c6985ad5fc914977ca160f71f.png)
![](https://img.xkw.com/dksih/QBM/2019/12/31/2367119581929472/2367691122499584/STEM/3e6a123b6ab04bd6932f9bd1b46e1916.png?resizew=148)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac9d295f00a7f3ff7b42402fd7410be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15128f25ebca3d8f53eaf4f5f17a805.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
您最近一年使用:0次
2020-01-01更新
|
245次组卷
|
3卷引用:上海市黄浦区2017-2018学年高一下学期期中终调研测试数学试题
上海市黄浦区2017-2018学年高一下学期期中终调研测试数学试题上海市莘庄中学2022-2023学年高一下学期5月月考数学试题(已下线)重难点专题02 解三角形的应用-2022-2023学年高一数学重难点题型分类必刷题(人教B版2019必修第四册)
名校
3 . 如图,在四边形
中,
,
,
,
,
.
的长;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d14e0c062448666691bbf505273971a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
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2020-08-06更新
|
1288次组卷
|
10卷引用:上海市高一下学期期末真题必刷04-期末考点大串讲(沪教版2020必修二)
(已下线)上海市高一下学期期末真题必刷04-期末考点大串讲(沪教版2020必修二)2016届北京市海淀区高三上学期期中考试文科数学试卷【全国百强校】北京师大实验中学2019届高三(上)期中数学(文科)试题天津市滨海新区2020届高三下学期居家反馈数学试题贵州省贵阳市民族中学2020-2021学年高一下学期第一次月考数学试题宁夏中宁县中宁中学2020-2021学年高二下学期第一次月考数学(文)试题宁夏银川市第一中学2023届高三上学期第四次月考数学(文)试题宁夏银川市三沙源上游学校2022-2023学年高一下学期期末考试数学试题北京市延庆区第一中学2024届高三上学期9月月考数学试题福建省三明市尤溪县第七中学2023-2024学年高一下学期期中考试数学试题
名校
4 . 在
中,已知
,
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96f3e2373808e8024a211b24c16519e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
名校
5 . 某菜农有两段总长度为
米的篱笆
及
,现打算用它们和两面成直角的墙
、
围成一个如图所示的四边形菜园
(假设
、
这两面墙都足够长)已知
(米),
,
,设
,四边形
的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e7380007-8063-48f9-aa5a-7371ddf7d4ec.png?resizew=160)
(1)将
表示为
的函数,并写出自变量
的取值范围;
(2)求出
的最大值,并指出此时所对应
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79467022c6cd9d7967379145b9ca2f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05226a3a152c80a359b5d7890bd8f888.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2932307706eaaceb5f60a6f8fc67968c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7228a531c3bd6d7c56ea68ac758cc0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e902eb263971b466d0fcd91c56b453.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/e7380007-8063-48f9-aa5a-7371ddf7d4ec.png?resizew=160)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
您最近一年使用:0次
2019-08-23更新
|
796次组卷
|
5卷引用:上海市曹杨二中2018-2019学年高一下期末数学试题
名校
6 . 在
中,若
,则角
的大小为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590e08729470930e74df5018cdd59e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-08-23更新
|
2558次组卷
|
5卷引用:上海市曹杨二中2018-2019学年高一下期末数学试题
上海市曹杨二中2018-2019学年高一下期末数学试题上海市曹杨二中2018-2019学年高三上学期期末数学试题(已下线)上海期末真题精选50题(小题压轴版)-2020-2021学年高一数学下册期中期末考试高分直通车(沪教版2020必修第二册)上海市曹杨第二中学2022-2023学年高一下学期期中数学试题(已下线)第01讲 两角和与差的三角函数-【帮课堂】2021-2022学年高一数学同步精品讲义(苏教版2019必修第二册)
名校
7 . 为了研究问题方便,有时将余弦定理写成:
,利用这个结构解决如下问题:若三个正实数
,满足
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ba07a669b1f519431dd0a73709f990.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cf36abf2bd948004cbfdeec58aba5b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c96e56783b70e24be8ed15d0f8df94af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/775823e86113632b8a4cde46a44a13a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e215f6a2fc60a1dd744769e3d06cf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ba07a669b1f519431dd0a73709f990.png)
您最近一年使用:0次
2019-08-23更新
|
1125次组卷
|
5卷引用:上海市曹杨二中2018-2019学年高一下期末数学试题
8 . 如图,某学生社团在校园内测量远处某栋楼
的高度,
为楼顶,线段
的长度为
,在
处测得
,在
处测得
,且此时看楼顶
的仰角
,已知楼底
和
、
在同一水平面上,则此楼高度![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
____
(精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32104db790d4e50ec851086996c62020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6c13b8f82ab4d6f721cb6dd01f4e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71ab3a5d1ea0c636cb9e215a2ea325ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0569f82414ff293c1404e1757e4ec74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/e1ec5d678ec42846e1d28301e3bfd4be.png)
![](https://img.xkw.com/dksih/QBM/2019/8/22/2274179592306688/2275002089218048/STEM/9dd18685883049c29995461650a1d477.png?resizew=12)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef959a420dc4a40d40e1960a68d1acce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/beb1ca2f-1447-4aea-ae39-69bdabf510a0.png?resizew=147)
您最近一年使用:0次
2019-08-23更新
|
498次组卷
|
4卷引用:2019年上海市长宁(嘉定)区高三上学期期末质量检测(一模)数学试题
2019年上海市长宁(嘉定)区高三上学期期末质量检测(一模)数学试题2019年上海市长宁区、嘉定区高三上学期期末教学质量检测(一模)数学试题【全国百强校】河北省邢台市第一中学2018-2019学年高一下学期第一次月考数学试题(已下线)专题4.7 解三角形及其应用举例-《2020年高考一轮复习讲练测》(浙江版)(讲)
名校
9 . 在
中,角
所对的边分别为
,已知:
,
且
,求角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
__________ .
![](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/009ea21d4742f2130ea66a95a35e3cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0af96af6dee490f7a7a47a95e50f0cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45632b3ca6ab6c0b05df0d5a838c375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26308ea6d8f321d27acbd7f9b131f9f1.png)
您最近一年使用:0次
10 . 设
的内角A,B,C的对边为
,b,c.已知
,b,c依次成等比数列,且
,延长边BC到D,若
,则
面积的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144228917cf098d9417c0b5d3e82122b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f8f01137e92c0f2e63467036ae9cce.png)
您最近一年使用:0次