如图,在正方形
中,O为对角线
的中点,E为正方形内一点,连接
,
,连接
并延长,与
的平分线交于点F,连接
,若
,则
的长度为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a26c2c53046cbfe83f84f5393373589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cfc2771aa0d5b97d2297f8a26a6f6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
A.2 | B.![]() | C.1 | D.![]() |
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2023年重庆市中考数学真题(B卷)(已下线)专题14 几何综合题(37题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)专题18 矩形菱形正方形(共39题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)专题13 特殊平行四边形-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(重庆专用)(已下线)专题26特殊的平行四边形(优选真题60道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【全国通用】(已下线)2023年重庆市中考数学真题(B卷)变式题6-10题重庆市实验外国语学校2023-2024学年九年级上学期期中数学模拟试题辽宁省锦州市凌河区第八初级中学2023-2024学年九年级上学期12月月考数学试题重庆市奉节县奉节长龙实验中学校2023-2024学年九年级上学期期末数学试题(已下线)第3讲 全等三角形(已下线)专题1 整体思想(已下线)专题9.30 正方形(直通中考)(提升练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)(已下线)专题9.44 中心对称图形——平行四边形(直通中考)(培优练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(苏科版)重庆市九龙坡区重庆实验外国语学校2023-2024学年九年级上学期第十次自主练习数学试题重庆市梁平区梁平区福德学校2023-2024年八年级下学期第一次月考数学试题(已下线)专题18.26 正方形(直通中考)(提升练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)(已下线)专题18.32 平行四边形(直通中考)(提升练)-2023-2024学年八年级数学下册基础知识专项突破讲与练(人教版)(已下线)重难点03+平行四边形与特殊平行四边形(8大题型+满分技巧+限时分层检测2)-2024年中考数学【热点·重点·难点】专练(全国通用) - 副本(已下线)中考热点05 几何求解选择类(4题型+满分技巧+限时检测)-2024年中考数学【热点·重点·难点】专练(重庆专用)(已下线)重难点04+平行四边形与特殊平行四边形(4考点8题型)2
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【推荐1】如图,在四边形
中,
,
,我们把这种两组邻边分别相等的四边形叫做“筝形”.筝形ABCD的对角线
、
相交于点O.已知
,
,小婵同学得到如下结论:①
是等边三角形;②
;③
;④点M、N分别在线段
、
上,且
,则
.其中正确的结论有( )个
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/1/8fd177e6-7734-43be-b997-7ef2d785ca35.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9149c116c750a53b286e543391503fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a54da28e0c5fb79d3d8b5758b89744.png)
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【推荐2】如图,在正方形
中,点E,F将对角线
三等分,且
.点G是
边上任意一点,则
的值不可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】如图,△OAB为等腰直角三角形(∠A=∠B=45°,∠AOB=90°),△OCD为等边三角形(∠C=∠D=∠COD=60°),满足OC>OA,△OCD绕点O从射线OC与射线OA重合的位置开始,逆时针旋转,旋转的角度为α(0°<α<360°),下列说法正确的有( )个
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017405625802752/3038601624330240/STEM/f33556802a474639a1296cfc8708bb21.png?resizew=134)
①当α=15°时,DC∥AB;
②当OC⊥AB时,α=45°;
③当边OB与边OD在同一直线上时,直线DC与直线AB相交形成的锐角为15°;
④整个旋转过程,共有10个位置使得△OAB与△OCD有一条边平行
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017405625802752/3038601624330240/STEM/f33556802a474639a1296cfc8708bb21.png?resizew=134)
①当α=15°时,DC∥AB;
②当OC⊥AB时,α=45°;
③当边OB与边OD在同一直线上时,直线DC与直线AB相交形成的锐角为15°;
④整个旋转过程,共有10个位置使得△OAB与△OCD有一条边平行
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解题方法
【推荐2】古希腊数学家发现“黄金三角形”很美。顶角为
的等腰三角形,称为“黄金三角形”,如图所示,
中,
,
,其中
,又称为黄金比率,是著名的数学常数。作
的平分线,交
于
,得到黄金三角形
;作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7967a506a4a0d1bed0558aa758f5c52a.png)
交
于
,
交
于
,得到黄金三角形
;作
交
于
,
交
于
,得到黄金三角形
;依此类推,我们可以得到无穷无尽的黄金三角形。若
的长为1,那么
的长为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b398c95494eddc79939f16e66cf4da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98474425eb86a28f2b01cec95643ae7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7967a506a4a0d1bed0558aa758f5c52a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69e858a2b8ca5932b9e4dd64568b6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab94459e87c666facddbe1a23ae1899d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,正方形
的边长为
,点
从点
出发滑着线段
向点
运动(不与点
,
重合),同时点
从点
出发沿着线段
向点
运动(不与点
,
重合,点
与点
的运动速度相同.
与
相交于点
,
为
中点、则有下列结论:
①
是定值;②
平分
;③当
运动到
中点时,
;④当
时,四边形
的面积是
.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191c1d68303fa3c15a3aae2cfa752878.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed24d7acba0b3a7ebf4d520296424a3.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/594c46cae6cb091e4e064da9077a926f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d97e9cf8403bccdc26a425b96f9de0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04eda020f2c9b814351490997b42745a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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【推荐2】如图,已知
,线段
长为6,
两端分别在
、
上滑动,以
为边作正方形
,对角线
、
相交于点
,连接
.则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/c425f011-c9a0-4646-b384-c188fc2a7f21.png?resizew=175)
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【推荐1】如图,在正方形
内有一点F,连接
,有
,若
的角平分线交
于点E,若E为
中点,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/d33c1833-4edb-435a-b7ea-fe71d2851931.png?resizew=143)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/537839f99b215939ba88e46b4f4deaf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/d33c1833-4edb-435a-b7ea-fe71d2851931.png?resizew=143)
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较难
(0.4)
【推荐2】如图1,四个全等的直角三角形围成一个大正方形,中间是个小正方形,这个图形是我国汉代赵爽在注解《周髀算经》时给出的,人们称它为“赵爽弦图”.在弦图中(如图2),连接
,并延长
交
于点K,连接
.若
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/00e448ac-929b-4c64-8b9a-230c4c5825df.png?resizew=254)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac8d18288dc7216f3a460a049a08e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bbf26fadcc5aa1c44679f775768d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6825f4dadc23360183c334f89f1900bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18bbf26fadcc5aa1c44679f775768d77.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/00e448ac-929b-4c64-8b9a-230c4c5825df.png?resizew=254)
A.![]() | B.2 | C.![]() | D.![]() |
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