如图1,在正方形
中,点P在
上,分别过点C、D作
于点E、G,联结
,过点C作
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c5eea7cf-e734-4835-a494-8c75fb17a3e1.png?resizew=407)
(1)求证:四边形
是正方形;
(2)求
的值;
(3)如图2,若
,
经过
的中点K,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848df8128ed091156e203864c0cd8eb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01430ca150d13745c6e0024b1d91cc88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4d11045e757d8ab8fc43dacfb4cce29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/c5eea7cf-e734-4835-a494-8c75fb17a3e1.png?resizew=407)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ec2c1bca9d89d16df525a45408aa76.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
更新时间:2023-12-09 21:07:08
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名校
【推荐1】如图,在△ABC中,已知AD平分∠BAC,E是边AB上的一点,AE=AC,F是边AC上的一点,联结DE、CE、FE,当EC平分∠DEF时,猜测EF、BC的位置关系,并说明理由.(完成以下说理过程)
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900194180448256/2900760079466496/STEM/b5485e0d-c458-47e2-9f72-d8b85d4570f4.png?resizew=168)
解:EF、BC的位置关系是______.
说理如下:
因为AD是∠BAC的角平分线(已知)
所以∠1=∠2.
在△AED和△ACD中,
,
所以△AED≌△ACD(SAS).
得__________(全等三角形的对应边相等).
![](https://img.xkw.com/dksih/QBM/2022/1/22/2900194180448256/2900760079466496/STEM/b5485e0d-c458-47e2-9f72-d8b85d4570f4.png?resizew=168)
解:EF、BC的位置关系是______.
说理如下:
因为AD是∠BAC的角平分线(已知)
所以∠1=∠2.
在△AED和△ACD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d0459bde8a85d22f2a51be50e63e8e.png)
所以△AED≌△ACD(SAS).
得__________(全等三角形的对应边相等).
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【推荐2】如图1,
和
都是等腰直角三角形,
,
,
的顶点
在
的斜边
上.
;
(2)猜想
之间的数量关系;并说明理由.
(3)如图2,若
,点
是
的中点,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96cc8a38e58b31f13fa88071375193f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5decffc1dbb11488717ac70380babea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb13c1026f1c19f7623ae92a701405b.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9380c1c1fa70d5220f527f2a19f893ae.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dceeb9bc33d948098f6e889ee2859eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐1】如图,点
是正方形
内一点,
,将
绕点
顺时针旋转90°,得到
,延长
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/a2f119dd-4eb7-4ccb-9a08-403e9707b316.png?resizew=136)
(1)求证:四边形
是正方形;
(2)连接
,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1070d38d2fea1dc88c6eb31d320b763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3b94566843e92ce775ff6bdf386fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4ce3f962c91f0d3c7b998b5fbb37b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/a2f119dd-4eb7-4ccb-9a08-403e9707b316.png?resizew=136)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5868de99a3e94b13316b0122f22d3f91.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810242c9205006b28c6bc6612c2b1cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f0387aa45327a1cc5487ff55b6096e.png)
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【推荐2】四边形
为正方形,点E为线段
上一点,连接
,过点E作
,交射线
于点F,以
为邻边作矩形
,连接
.
是正方形;
(2)若
,
,求
的长度;
(3)当线段
与正方形
的某条边的夹角是
时,直接写出
的度数.
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/564ca8ee1d170643c2430138c3bdf893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3acee288e75061ac72203b09fce29904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
(3)当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7652fd5598a9eaa011726784cae56bc8.png)
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【推荐3】数学学习小组“文化年”最近正在进行几何图形组合问题的研究,认真研读以下三个片段,并回答问题.
【片断一】小文说:将一块足够大的等腰直角三角板置于一个正方形中,直角顶点与对角线交点.重合,在转动三角板的过程中我发现某些线段之间存在确定的数量关系.
如图(1),若三角板两条直角边的外沿分别交正方形的边AB, BC于点M, N,则①OM+ON=MB+NB;②AM+CN=
OD.
请你判断他的猜想是否正确?若正确请说明理由;若不正确请说明你认为正确的猜想并证明.
【片断 】小化说:将角板中个45°角的预点和正方形的一个顶点重合放置,使得这个角的两条边与正方形的一组邻边有交点.
如图(2),若以A为顶点的45°角的两边分别交正方形的边BC、 CD于点M, N.交对角线BD于点E、F,我发现:BE2+DE2=2AE2,只要准确旋转图(2)中的一个三角形就能证明这个结论.
请你在如图中画出图形并写出小化所说的具体的旋转方式:______________________________.
【片断三】小年说:将三角板的一个45°角放置在正方形的外部,同时角的两边恰好经过正方形两个相邻的顶点,
如图(3),设顶点为E的45°角位于正方形的边AD上方,这个角的两边分别经过点B、C,连接EA, ED,那么线段EB, EC, ED也存在确定的数量关系: (EB +ED)2=2EC2 ,请你证明这个结论
【片断一】小文说:将一块足够大的等腰直角三角板置于一个正方形中,直角顶点与对角线交点.重合,在转动三角板的过程中我发现某些线段之间存在确定的数量关系.
如图(1),若三角板两条直角边的外沿分别交正方形的边AB, BC于点M, N,则①OM+ON=MB+NB;②AM+CN=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
请你判断他的猜想是否正确?若正确请说明理由;若不正确请说明你认为正确的猜想并证明.
【片断 】小化说:将角板中个45°角的预点和正方形的一个顶点重合放置,使得这个角的两条边与正方形的一组邻边有交点.
如图(2),若以A为顶点的45°角的两边分别交正方形的边BC、 CD于点M, N.交对角线BD于点E、F,我发现:BE2+DE2=2AE2,只要准确旋转图(2)中的一个三角形就能证明这个结论.
请你在如图中画出图形并写出小化所说的具体的旋转方式:______________________________.
【片断三】小年说:将三角板的一个45°角放置在正方形的外部,同时角的两边恰好经过正方形两个相邻的顶点,
如图(3),设顶点为E的45°角位于正方形的边AD上方,这个角的两边分别经过点B、C,连接EA, ED,那么线段EB, EC, ED也存在确定的数量关系: (EB +ED)2=2EC2 ,请你证明这个结论
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189420521316352/2190616625520640/STEM/e6f3fa3e4c714a75a77812428edb79a9.png?resizew=566)
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【推荐1】如图,已知ED∥BC,∠EAB=∠BCF,
![](https://img.xkw.com/dksih/QBM/2019/5/20/2207572357857280/2213252196147200/STEM/b6f7d47e28924e47b59821591f8713e0.png?resizew=223)
(1)求证:四边形ABCD为平行四边形;
(2)求证:OB2=OE•OF;
(3)连接OD、BD,若∠OBC=∠ODC,OD=6,sin∠AOE=
,求对角线BD的长.
![](https://img.xkw.com/dksih/QBM/2019/5/20/2207572357857280/2213252196147200/STEM/b6f7d47e28924e47b59821591f8713e0.png?resizew=223)
(1)求证:四边形ABCD为平行四边形;
(2)求证:OB2=OE•OF;
(3)连接OD、BD,若∠OBC=∠ODC,OD=6,sin∠AOE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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解题方法
【推荐2】如图,已知:梯形
中,
,
、
交于点
,
是
延长线上一点,点
在
上,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e4fbe05ebee0911bc6314203b891bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412ed1aa281cb321facf8f4ba0cb6b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e80a77e82aabf352ca79bb2df9d8a0.png)
![](https://img.xkw.com/dksih/QBM/2020/9/6/2550380087148544/2551782139387904/STEM/33d7c1f1e16f435d8b0fa6abdff38f29.png?resizew=163)
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【推荐1】如图,
是
的直径,
是
的弦,且点C是劣弧
的中点,
与
交于点E,连接
.
;
(2)若
,
.求证:四边形
是菱形;
(3)在(2)的条件下,过点C作
的切线,交
的延长线于点H,则
的面积等于_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.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/d31102990b0ca7fcc59ec3074ba29c7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a852b9a83acbe4029d47f1e49538883.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/065f2c3527fcc9d84939c47ac8640643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3139747ad9c21b98a50c576fd1398c.png)
(3)在(2)的条件下,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f644513fa757d443a921a9d19534fa42.png)
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【推荐2】如图,两个全等的四边形
和
,其中四边形
的顶点
位于四边形
的对角线交点
.若四边形
和
都是矩形,
,
,则下列数量关系中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/eb30be6d-dabb-4fa6-93d6-1a326d27613e.png?resizew=211)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5068b690ac4a15e3d3cdd545e0b9942.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/12/eb30be6d-dabb-4fa6-93d6-1a326d27613e.png?resizew=211)
A.![]() | B.![]() |
C.![]() | D.重叠部分的面积始终等于四边形![]() ![]() |
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