如图,在
中,
,将
绕点C逆时针旋转得到
,点M是
的中点,点N是
的中点,连接
,若
,求线段
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf2c9853c78aba1cc8436d11f2e5a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f73e4d0557ca664d1edd70b7275667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78b65065ec3a0cb4b050989165c003d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
更新时间:2024-04-20 16:42:19
|
相似题推荐
解答题-问答题
|
适中
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【推荐1】如果一个三角形的所有顶点都在网格的格点上,那么这个三角形叫做格点三角形,如图,请在下列给定网格(每个小方格边长均为1)中按要求解答下面问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/aeda5e41-6033-4101-8006-8eeabdc57897.png?resizew=280)
(1)方格图1中格点△ABC的面积为 ;
(2)已知某格点三角形有两条边长分别为
、
且面积与△ABC相等,则这个三角形第三边长为 ;
(3)以图2中C为顶点,
为边长构造等腰直角三角形,顶点均为格点,则这样的格点三角形有 种(全等算一种),共有 个.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/aeda5e41-6033-4101-8006-8eeabdc57897.png?resizew=280)
(1)方格图1中格点△ABC的面积为 ;
(2)已知某格点三角形有两条边长分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(3)以图2中C为顶点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
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解答题-问答题
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【推荐2】已知a,b,c是△ABC的三边长,
,
,设
的周长是x.
(1)求c与x的取值范围;
(2)若x是小于18的偶数,试判断
的形状.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c355f11471a38f5583a434a1ddeb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82986ab38a4ae58593191ccae2a44f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求c与x的取值范围;
(2)若x是小于18的偶数,试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-证明题
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【推荐1】如图,在等边
中,
,将含
角的三角板中
角的顶点D放在边
上移动,使这个
角的两边与
的边
,
分别交于点E,F,且
始终与
垂直,连接
.
是什么三角形?请说明理由.
(2)如图1,若
,求
的长.
(3)如图2,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
(2)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25eff69a4a0dc7a7ab183843303d333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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真题
【推荐2】如图,已知在Rt△ABC中,
,D是AB边上一点,以BD为直径的半圆O与边AC相切,切点为E,过点O作
,垂足为F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/301e6563-78e5-4b2e-ae18-43ddfcdae87c.png?resizew=230)
(1)求证:
;
(2)若
,
,求AD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/301e6563-78e5-4b2e-ae18-43ddfcdae87c.png?resizew=230)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2715d1de9c1d6a2402b20d56de61afe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
,以AB为直径的
交AC于点D,E是BC的中点,连接DE,BD.
(1)求证:DE是
的切线;
(2)若
,
,求BD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/822f041d-7d1e-4208-b43d-6780d3676904.png?resizew=129)
(1)求证:DE是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f98e9c9cbdad60f42c7be2e38a07915.png)
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解答题-证明题
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【推荐2】如图,在Rt△ABC中,∠ACB=90°,CD⊥AB于点D,E是AC的中点,DE的延长线与BC的延长线交于点F.求证:
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980516087283712/2980745677381632/STEM/b6f76d4c103342c994ac82ff5c82819e.png?resizew=168)
(1)△FDC∽△FBD;
(2)AC•BF=BC•DF.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980516087283712/2980745677381632/STEM/b6f76d4c103342c994ac82ff5c82819e.png?resizew=168)
(1)△FDC∽△FBD;
(2)AC•BF=BC•DF.
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名校
【推荐1】如图,在△ABC中,∠ABC=90°,BA=BC=3
,将△ABC绕点C逆时针旋转60°得△MNC,连结BM ,求BM 的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/ffbc744f-3a72-4184-a105-e1c000e1b1ec.jpg?resizew=126)
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解答题-计算题
|
适中
(0.65)
【推荐2】如图,在
中,
,将
绕点
逆时针旋转得到
,且点
落在
边上,连接
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe59deb5eff9123704c5505830b597e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da48e9a0b9eea661a03ca92b5a831362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d20c8307a62e0b31716bc25179d648.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/469d1683-de64-452a-b114-38fce537c3d8.png?resizew=177)
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解答题-证明题
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【推荐3】定义:如图1,A,B为直线l同侧的两点,作点A关于直线l对称的点
,连接
,连接
交直线l于点P,连接AP,则称点P为点A,B关于直线l的“等角点”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/0ddac0d6-d3e8-4797-92f5-0f7b765a7de2.png?resizew=585)
(1)由“等角点”的定义可知:如图1,点A和点
关于直线l对称,
∴
.
∵
,
∴∠______=∠______,
可得若满足∠______=∠______,则点P为点A,B关于直线l的“等角点”.
(2)如图2,在△ABC中,D,E分别是AB,AC上的点,AB=AC,AD=AE,然后将△ADE绕点A顺时针旋转一定角度,连接BD,CE,得到图3,试写出BD与CE的数量关系,并说明理由.
(3)在(2)的条件下,延长CE交BA的延长线于点N,延长BD至点M,使DM=EN,连接AM,得到图4,求证:点A为点C,M关于直线BN的“等角点”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/0ddac0d6-d3e8-4797-92f5-0f7b765a7de2.png?resizew=585)
(1)由“等角点”的定义可知:如图1,点A和点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37903fc990959ec29d59ac66559185d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc759cbc372867cb9116a084277bca6.png)
∴∠______=∠______,
可得若满足∠______=∠______,则点P为点A,B关于直线l的“等角点”.
(2)如图2,在△ABC中,D,E分别是AB,AC上的点,AB=AC,AD=AE,然后将△ADE绕点A顺时针旋转一定角度,连接BD,CE,得到图3,试写出BD与CE的数量关系,并说明理由.
(3)在(2)的条件下,延长CE交BA的延长线于点N,延长BD至点M,使DM=EN,连接AM,得到图4,求证:点A为点C,M关于直线BN的“等角点”.
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