名校
解题方法
1 . (1)如图,在矩形ABCD中,
,E为AB的中点,F是BC边上靠近点B的三等分点,AF与DE于点G.求
的余弦值;
(2)利用本学期所学知识(向量或解三角形)证明:平行四边形的两条对角线长的平方之和等于四条边长的平方之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecaea23c77bf54da0efcf95c463f0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d6902c8862bd2616be038549f77aff.png)
(2)利用本学期所学知识(向量或解三角形)证明:平行四边形的两条对角线长的平方之和等于四条边长的平方之和.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/91f6f1fe-5465-4e7f-b754-3b346a2cb81f.png?resizew=113)
您最近一年使用:0次
2 . 如图所示,在山顶
点已测得
,
,
的俯角分别为
,
,
,其中
,
,
为山脚两侧共线的三点,现欲沿直线
开通穿山隧道,为了求出隧道
的长,至少还需要直接测量出
,
,
中的哪些线段长?把你上一问指出的需要测量得线段长和已测得的角度作为已知量,写出计算隧道
的步骤.
![](https://img.xkw.com/dksih/QBM/2018/3/14/1901794656919552/1906225170636800/STEM/74f2b76b703b488ab486b9d8e543099f.png?resizew=304)
解:
步骤
:还需要直接测量得线段为.
步骤
:计算线段.
计算步骤:
步骤
:计算线段
计算步骤:
步骤
:计算线段
计算步骤:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2018/3/14/1901794656919552/1906225170636800/STEM/74f2b76b703b488ab486b9d8e543099f.png?resizew=304)
解:
步骤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
步骤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
计算步骤:
步骤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
计算步骤:
步骤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
计算步骤:
您最近一年使用:0次
名校
解题方法
3 . 某校学生利用解三角形有关知识进行数学实践活动.
处有一栋大楼,某学生选
、
(与
在同一水平面上)两处作为测量点,测得
的距离为
,
,
,在
处测得大楼(大楼
与水平面
垂直)楼顶
的仰角
为
.
两点间的距离;
(2)求大楼的高度及二面角
的正切值.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c56c87fd6bf8a44244ba51a9d244e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0ec7f8ab857cd441a82389b246230a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
(2)求大楼的高度及二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab6d47edbcc2ae6efcfd7f28e401e3e9.png)
您最近一年使用:0次
4 . 三角学起源于土地和天文学中的测量.1752年,法国天文学家拉卡伊(1713-1762)和他的学生拉朗德(1732-1807)利用三角测量法首次精确地计算出地月距离.他们的测量方案是:拉卡伊和拉朗德分别来到观测地德国柏林(A点)和非洲南端的好望角(
点),这两个地方经度相近,可看做在同一经度线上,纬度分别是北纬
度和南纬
度,他们同一时间分别在这两个地方进行观测.如图所示,当夜幕降临时,月亮从地平线上越升越高,当它到达最高点,即
是平面四边形时,在A点(柏林)测出月亮的天顶距
(即离开头顶方向的角度),在
点(好望角)测出月亮的天顶距
.在
中求出
,和
,在此基础上,解
,求出地月距离的近似值
或
.设地球的半径为
,利用测量方案中提供的数据(
,
,
,
,
),求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/f0e204c4-a785-4edc-91a8-0d88f67d30f4.png?resizew=184)
(1)
和
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12ee28006ffc4b287e6762b01608852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc43aea5dd0fef2081e399adb23560e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997ac1051092089b358afbad3a3d6874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943b765718479c160ba61ec5c6f8c5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e29bf5652f0d4f764c3606efcdb445f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943b765718479c160ba61ec5c6f8c5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e29bf5652f0d4f764c3606efcdb445f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12ee28006ffc4b287e6762b01608852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc43aea5dd0fef2081e399adb23560e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/f0e204c4-a785-4edc-91a8-0d88f67d30f4.png?resizew=184)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
名校
解题方法
5 . 某校学生利用解三角形有关知识进行数学实践活动.
处有一栋大楼,某学生选
,
两处作为测量点,测得
的距离为
,
,
,在
处测得大楼楼顶
的仰角
为75°.
两点间的距离;
(2)求大楼的高度.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c56c87fd6bf8a44244ba51a9d244e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0ec7f8ab857cd441a82389b246230a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求大楼的高度.
您最近一年使用:0次
2023-04-21更新
|
1546次组卷
|
8卷引用:湖南省长沙市长郡中学2022-2023学年高一下学期期中数学试题
名校
6 . 某校学生利用解三角形有关知识进行数学实践活动.
处有一栋大楼,某学生选(与
在同一水平面的)
、
两处作为测量点,测得
的距离为
,
,
,在
处测得大楼楼顶
的仰角
为
.
(1)求
两点间的距离;
(2)求大楼的高度.(第(2)问不计测量仪的高度,计算结果精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c56c87fd6bf8a44244ba51a9d244e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0ec7f8ab857cd441a82389b246230a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/30ca0028-ebd7-4434-9e91-d70d077fee39.png?resizew=190)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
(2)求大楼的高度.(第(2)问不计测量仪的高度,计算结果精确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6563eb699f1bbc39eced661a2ebfcce4.png)
您最近一年使用:0次
7 . 在
中,
分别为内角
的对边,点
在
上,
.
(1)从下面条件①、②中选择一个条件作为已知,求
;
(2)在(1)的条件下,求
面积的最大值.
条件①:
;
条件②:
.
注:若条件①和条件②分别解答,则按第一个解㯚计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.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/ddcfd39bb0e6c90954cb27f9d29a8824.png)
(1)从下面条件①、②中选择一个条件作为已知,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)在(1)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c02cfd27071a75f0a4ca5860e08a37b.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0c8596fa32b6e42eae3644514d0861.png)
注:若条件①和条件②分别解答,则按第一个解㯚计分.
您最近一年使用:0次
2023-03-26更新
|
842次组卷
|
3卷引用:山西省太原市2023届高三一模数学试题
8 . 某校学生利用解三角形有关知识进行数学实践活动.A处有一栋大楼,某学生选
,
两处作为测量点,测得
的距离为
m,
,
,在
处测得大楼楼顶
的仰角
为
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966617037627392/2969306591240192/STEM/ca0a8401318442d19711a7477b7b9a22.png?resizew=201)
(1)求
两点间的距离;
(2)求大楼的高度.(第(2)问不计经纬仪的高度,计算结果精确到
m.参考数据:
,
,
)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f1af4b44b2e97e8f319bab4ae9010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0ec7f8ab857cd441a82389b246230a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c12aeebfa1af16f325c98a43bb08c1.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966617037627392/2969306591240192/STEM/ca0a8401318442d19711a7477b7b9a22.png?resizew=201)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求大楼的高度.(第(2)问不计经纬仪的高度,计算结果精确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52881be613aa404e553da30d8987cfad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dad09268b7cb8bfcbea010cb6d2a29e.png)
您最近一年使用:0次
9 . 解三角形在测量上有着广泛的应用,下面各图描述了测量中的一些基本问题,你能根据图示说出求解
的过程吗?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求距离 | 两点间不可达又不可视 | 两点间可视但不可达 | 两点都不可达 |
求高度 | 底部可达 | 底部不可达 | |
您最近一年使用:0次
解题方法
10 . (1)求方程
在
上的解;
(2)在锐角△
中,
,
,若
,周长为y,把y表示成x的函数,并求y的取值范围;
(3)求函数
的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60a981476baa1d1dfdfc3c0a67fd51d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827e5f23b5eb05c37a71320b76125035.png)
(2)在锐角△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104e4c6253dac1d2ceb5376aa060433a.png)
(3)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e4cdfc2f35aff9feff138a87e29476.png)
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