名校
1 . 已知三角形花园
,顶点
、
、
为花园的三个出入口,满足
,
,
(单位:米).
(1)求三角形花园的面积(精确到
平方米);
(2)若三角形
个内角均小于
,到三角形三个顶点距离之和最短的点
必满足
、
、
正好三等分
点所在的周角,该点所对三角形三边的张角相等,均为
.所以这个点也称为三角形的等角中心.请根据此知识求出三角形花园的最佳会合点
到三个出入口的最小距离和(满足到三个出入口的距离和最小).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/c5670f9370a4f8ac65a2df3a966d93ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7912f2378feefdeeed69c298a7360b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dbcae1e3ecea7312a1120e8b4c442a9.png)
(1)求三角形花园的面积(精确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(2)若三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231b861d6d1f1d0b9f52b041cb40eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
名校
2 . 某水产养殖户承包一片靠岸水域.如图,
、
为直线岸线,
米,
米,
,该承包水域的水面边界是某圆的一段弧
,过弧
上一点
按线段
和
修建养殖网箱,已知
.
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877362589736960/2878134138093568/STEM/5cf2c44e260345edaf70618b57930d9a.png?resizew=178)
(1)求岸线上点
与点
之间的直线距离;
(2)如果线段
上的网箱每米可获得40元的经济收益,线段
上的网箱每米可获得30元的经济收益.记
,则这两段网箱获得的经济总收益最高为多少?(精确到元)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b711d09cf350b68728ace265fc88d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/602773cbc4969675b9e28c8fa8f77d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d162c29b1e484cfc87350dd68f00b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/49c27ed2753bc9782bc9fa26755eb582.png)
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877362589736960/2878134138093568/STEM/5cf2c44e260345edaf70618b57930d9a.png?resizew=178)
(1)求岸线上点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)如果线段
![](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/513cb0e220a0fed33454151e303bcbe7.png)
您最近一年使用:0次
2021-12-22更新
|
850次组卷
|
4卷引用:上海市宝山中学2022-2023学年高二上学期9月月考数学试题
上海市宝山中学2022-2023学年高二上学期9月月考数学试题上海市浦东新区2022届高三上学期一模数学试题(已下线)专题4-4 三角函数与解三角形大题归类-2022年高考数学毕业班二轮热点题型归纳与变式演练(全国通用)上海市复旦大学附属中学2023届高三下学期开学考试数学试题
名校
解题方法
3 . 某居民小区为缓解业主停车难的问题,拟对小区内一块扇形空地
进行改建.如图所示,平行四边形
区域为停车场,其余部分建成绿地,点
在围墙
弧上,点
和点
分别在道路
和道路
上,且
米,
,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/087a7d09-cf5d-4d41-a0db-4b986044ed0b.png?resizew=149)
(1)求停车场面积
关于
的函数关系式,并指出
的取值范围;
(2)当
为何值时,停车场面积
最大,并求出最大值(精确到
平方米).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40b8789cc8d81b3cf64f0b318ab982a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef6138f7648bb46524b4ab42e661fc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a99c751c30b3784cd27036b4a5b48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259728433d68902065408fb6a34c6d4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/087a7d09-cf5d-4d41-a0db-4b986044ed0b.png?resizew=149)
(1)求停车场面积
![](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)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
您最近一年使用:0次
2020-02-29更新
|
1040次组卷
|
6卷引用:2020届上海市上海交通大学附属中学高三下学期考前测试数学试题
名校
4 . 如图所示,经过村庄
有两条夹角为
的公路
,根据规划要在两条公路之间的区域内修建一工厂
,分别在两条公路边上建两个仓库
(异于村庄
),要求
(单位:千米),记
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b4c855fa-a28c-4614-9073-ab807aa7a87d.png?resizew=152)
(1)将
用含
的关系式表示出来;
(2)如何设计(即
为多长时),使得工厂产生的噪声对居民影响最小(即工厂与村庄的距离
最大)?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd43cabbd47c77ac976ccfd3229dae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e31cf7ea7942bbc0fe4680878e5dd2f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b4c855fa-a28c-4614-9073-ab807aa7a87d.png?resizew=152)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8d07bad19b6cfac4dba9a919899841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)如何设计(即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8d07bad19b6cfac4dba9a919899841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
您最近一年使用:0次
2019-12-01更新
|
447次组卷
|
6卷引用:上海市海滨中学2018-2019学年高三上学期期中数学试题
名校
5 . 凸四边形就是没有角度数大于
的四边形,把四边形任何一边向两方延长,其他各边都在延长所得直线的同一旁,这样的四边形叫做凸四边形,如图,在凸四边形
中,
,
,
,
,当
变化时,对角线
的最大值为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/3b88bf3d-d381-460f-87bc-677580235264.png?resizew=150)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e7a123c9cc0e058db28841fb0edcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf10d92f20501e19d25f6f4159aab89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/3b88bf3d-d381-460f-87bc-677580235264.png?resizew=150)
A.3 | B.4 | C.![]() | D.![]() |
您最近一年使用:0次