1 . 图1、图2均是
的正方形网格,每个小正方形的顶点称为格点,小正方形的边长为1,点A、B、C均在格点上.在图1、图2中,只用无刻度的直尺,在给定的网格中按要求画图,不要求写出画法,保留作图痕迹.
的中线
;
(2)在图2中
的边
上找到一点F,使
;
;
(3)
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a96e9c2e2a15130d1d56a1d0e16b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)在图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3deee661336684541870cef3da7dcbd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51b93087e59c2e08258bd523aa77807e.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b9a53e552116848849b76dab92d0ac.png)
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2 . 将直角
绕着直角顶点C旋转一定的角度,得到
,点B正好落在DE边上,连接AE,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b265d121f9ebc13671a5719604476a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777c0e97b43abd2d4556cb0df7184194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b351337bbbf0e7c10ac201302acf90.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 如图,在由边长为1的小正方形组成的网格中.点A,B,C,D都在这些小正方形的格点上,AB、CD相交于点E,则
的值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe541ab52afc5d8574049a95d923833.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/4dc2aaca-d6d2-479f-ad67-29548a669703.png?resizew=137)
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4 . 在
中,
,
,
,那么
的正弦值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
A.![]() | B.7 | C.![]() | D.![]() |
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5 . 如图,∠α的顶点位于正方形网格的格点上,若
,则满足条件的
是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a8160bfd7a8813797ee46ee49be69c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2578ce50ea905e7c717199da9ef8630.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 在
中,若
,
,
,则
的值为 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
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2024-03-06更新
|
270次组卷
|
21卷引用:【市级联考】江苏省连云港市2018届九年级(上)期末数学试卷
【市级联考】江苏省连云港市2018届九年级(上)期末数学试卷福建省莆田市2020-2021学年九年级上学期期末数学试题安徽省合肥市长丰县2020-2021学年九年级上学期期末数学试题北京市密云区2022一2023学年九年级上学期期末考试数学试卷2016届江苏省盐城市景山中学九年级上学期第三次段考数学试卷北师大版九年级下册数学 第一章-直角三角形的三边关系-同步基础练习人教版数学九年级下册综合练习题【校级联考】江苏省江阴市澄东片2019届九年级第二学期期中数学试题2022年山东省滨州市中考数学真题(已下线)专题16 解直角三角形-2022年中考数学真题分项汇编(全国通用)(第1期)(已下线)专题06锐角三角函数与解三角形2023年山东省日照市五莲县许孟镇初级中学中考一模数学试题(已下线)专题19锐角三角函数(精选45道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【山东专用】山东省泰安市新泰市龙廷镇中心学校2023-2024学年九年级上学期10月月考数学试题广东省深圳市罗湖区滨河实验中学2023-2024学年九年级上学期月考数学试题(已下线)XDRzkgssxzw956(已下线)第01讲 锐角三角函数和特殊角的三角函数(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学下册《知识解读·题型专练》(人教版)(已下线)第01讲 锐角三角函数和特殊角的三角函数(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学下册《知识解读·题型专练》(北师大版)(已下线)第01讲 锐角三角函数和特殊角的三角函数(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学下册《知识解读·题型专练》(苏科版)(已下线)第01讲 锐角三角函数和特殊角的三角函数(知识解读+真题演练+课后巩固)-2023-2024学年九年级数学下册《知识解读·题型专练》(浙教版)(已下线)专题01锐角三角函数 (3个知识点5种题型1个易错点1种中考考法)-【帮课堂】2023-2024学年九年级数学下册同步学与练(北师大版)
名校
7 . 如图,在菱形
中,对角线
相交于点
,点
为
的中点,连结
并延长到点
,使
,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/ab01399a-63c7-4307-8d93-373d3105a9ad.png?resizew=210)
(1)求证:四边形
是矩形;
(2)若
,则
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892fc7c63a5c3f2ccf8c64217df9e8b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acb5e90dbcc3f3340916a3a11cc4612.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/ab01399a-63c7-4307-8d93-373d3105a9ad.png?resizew=210)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0562e90f77707d71121703da94c0eab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfa4c1d17db908981e9de25eaff53de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73d9a784cde81ac8aa46b1c5c398195c.png)
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8 . 在
中,
,
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b01adc561735ff5be9bb97266918f2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-04更新
|
146次组卷
|
6卷引用:2015届北京市平谷区九年级上学期期末考试数学试卷
9 . 在
中,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72511f149a1b13af02d0e1421d3a63a5.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be7bb04798dea65725a48893104b24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72511f149a1b13af02d0e1421d3a63a5.png)
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10 . 如图,
,
,则
( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/b858a96e-8a20-4229-ada9-872282b56410.png?resizew=233)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/120927bd3671bc91874ae25f1282f5ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28b0a5504906a80fa67723b2c0b33faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47b0f7484ec3d8fb438ef8735ef3e9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/b858a96e-8a20-4229-ada9-872282b56410.png?resizew=233)
A.![]() | B.![]() | C.![]() | D.![]() |
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