1 . 已知:如图,在
中,
,垂足为点
,
,点
为边
上一点,且
,联结
并延长,交边
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726603440832512/2729447028080640/STEM/a17fbda94056487a9f39332ad0af1543.png?resizew=216)
(1)求证:
;
(2)过点
作
的平行线交
的延长线于点
,联结
.如果
,求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3620030e8808da46df97330103827913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726603440832512/2729447028080640/STEM/a17fbda94056487a9f39332ad0af1543.png?resizew=216)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
(2)过点
![](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/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9a06b47bbc9a94f69381592716b9cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99bc9e301f78a1af74825fbab9766e15.png)
您最近一年使用:0次
2 . 如图,已知在梯形ABCD中,AD//BC,对角线BD平分∠ABC,点G在底边BC上,联结DG交对角线AC于F,∠DGB=∠DAB.
(1)求证:四边形ABGD是菱形;
(2)联结EG,求证:BG•EG=BC•EF.
(1)求证:四边形ABGD是菱形;
(2)联结EG,求证:BG•EG=BC•EF.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712447944761344/2714698425401344/STEM/e85e07ce9ecc40d08a4922559efb839d.png?resizew=303)
您最近一年使用:0次
名校
3 . 如图,菱形
中,
,点
在
边上,且
,动点
在
边上,连接
,将线段
绕点
顺时针旋转
至线段
,连接
,则线段
长的最小值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/691fe6cebd4a3f201b86ee96edf8338f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fbc3a1f1e848cf1349b9327be8607d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2021/3/14/2677711050178560/2685550228946944/STEM/7c7ca33ea7d9402d8b884a955b86e7f0.png?resizew=166)
您最近一年使用:0次
2021-03-25更新
|
540次组卷
|
4卷引用:专题14 动态几何(考点专练)-备战2021年中考数学考点微专题(上海专用)
(已下线)专题14 动态几何(考点专练)-备战2021年中考数学考点微专题(上海专用)2021年陕西省西安市碑林区西北工大附中中考数学一模试题2021年陕西省西北工业大学附属中学九年级数学二模试题2021年贵州省贵阳市南明区九年级摸底考试数学试题
2021九年级·上海·专题练习
4 . 已知:如图,在梯形
中,
∥
,
,点
在
的延长线上,
,
.
![](https://img.xkw.com/dksih/QBM/2021/2/7/2652803030687744/2654113532485632/STEM/824f7279-82c9-4191-a3d5-54b4d4ab24b9.png)
(1)求证:
;
(2)当
平分
时,求证:△
是等腰直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a6ead9dc8eb9f3a2993a64908918b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2291de85a2a29ff360a4515cce99c804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524d4a0c1990fdca997bf894cfcd2cf0.png)
![](https://img.xkw.com/dksih/QBM/2021/2/7/2652803030687744/2654113532485632/STEM/824f7279-82c9-4191-a3d5-54b4d4ab24b9.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4084fa4c6792ad96c47d0ac540fa82.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8257b6bd25104e07b9ad935c0a3aac4.png)
您最近一年使用:0次
名校
5 . 如图,已知在正方形
中,
为
中点,以
为顶点作
交
于点
,则
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf4c7140e3174fafeac170da1963aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55ceaab9f4b56362e81c1bdf2a75dba.png)
![](https://img.xkw.com/dksih/QBM/2020/11/12/2591297587044352/2591569936195584/STEM/130c5ff7-f28c-47ee-9ce1-b093d9462c59.png?resizew=195)
您最近一年使用:0次
名校
6 . 如图,在
中,
边上的高
和中线
及
的平分线
将
四等分,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99dd0e0c0fdd50bf56532ef492c5de17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bade41170c7d831b86c622977f7c402.png)
![](https://img.xkw.com/dksih/QBM/2020/11/12/2591297587044352/2591569936179200/STEM/d35dc44a-9a0e-4183-a653-4254e94f8340.png?resizew=261)
您最近一年使用:0次
7 . 如图,在
中,
,
,点
在
上,点
在
上,
,连接
,
,
,垂足为
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093db5b63dfd1ac4c84692a168f7ace0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/e03ca3e334c5290ab28b4b4a883c90c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abf4ebac2769eec53d410c7532cd101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55963a9b9b02737110f57a377b41cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e4279b633e860e707c8535adbf191a9.png)
![](https://img.xkw.com/dksih/QBM/2020/8/21/2532611129106432/2532753019420672/STEM/0f08bcc7117744c2ae0baaacae3dbaec.png?resizew=202)
您最近一年使用:0次
解题方法
8 . 如图,点P在射线AB的上方,且∠PAB=45°,PA=2+2
,点M是射线AB上的动点(点M不与点A重合),现将点P绕点A按顺时针方向旋转60°到点Q,将点M绕点P按逆时针方向旋转60°到点N,连接AQ,PM,PN,作直线QN.
(1)求证:AM=QN;
(2)当PN⊥QN时,求∠APN的度数;
(3)连接MN,若△MPN的外心恰好在PQ上,求AM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求证:AM=QN;
(2)当PN⊥QN时,求∠APN的度数;
(3)连接MN,若△MPN的外心恰好在PQ上,求AM的长.
![](https://img.xkw.com/dksih/QBM/2020/7/21/2510447030337536/2510766721343488/STEM/1c39b030ccc34df294d9784b6a7ad036.png?resizew=191)
您最近一年使用:0次
9 . 如图,正方形
,点
分别在
,
上,且
,
与
相交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97075fe3c2a105f5d2d0a27a9f2b3410.png)
![](https://img.xkw.com/dksih/QBM/2020/7/7/2500950798696448/2501519957590016/STEM/eac56b51f7484b1ebc87244e8e2a7a95.png?resizew=141)
您最近一年使用:0次
2020-07-08更新
|
378次组卷
|
4卷引用:专题8.2 四边形-备战2021年中考数学精选考点专项突破题集(上海专用)
(已下线)专题8.2 四边形-备战2021年中考数学精选考点专项突破题集(上海专用)2020年2020年辽宁省大连市中山区九年级质量检测二模数学试题陕西省咸阳市秦都区咸阳百灵学校2020-2021学年九年级上学期期中数学试题2023年福建省漳州市漳浦县中考一模数学试题
10 . 如图所示的方格纸是由9个大小完全一样的小正方形组成的.点A、B、C、D均在方格纸的格点(即图中小正方形的顶点)上,线段AB与线段CD相交于点E.设图中每个小正方形的边长均为1.
(1)求证:AB⊥CD;
(2)求sin∠BCD的值.
(1)求证:AB⊥CD;
(2)求sin∠BCD的值.
![](https://img.xkw.com/dksih/QBM/2020/5/30/2473627092320256/2475891857260544/STEM/f49f3df958b3421598e5926854bc9b29.png?resizew=120)
您最近一年使用:0次