【问题思考】如图1,点E是正方形
内的一点,过点E的直线
,以
为边向右侧作正方形
,连接
,直线
与直线
交于点P,则线段
与
之间的关系为______.
【问题类比】
如图2,当点E是正方形
外的一点时,【问题思考】中的结论还成立吗?若成立,请证明你的结论;若不成立,请说明理由;
【拓展延伸】
如图3,点E是边长为6的正方形
所在平面内一动点,【问题思考】中其他条件不变,则动点P到边
的最大距离为______(直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
【问题类比】
如图2,当点E是正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【拓展延伸】
如图3,点E是边长为6的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/4eeab89a-cfdb-4142-af69-4fc71c1330fd.png?resizew=534)
2023·江苏盐城·一模 查看更多[4]
2023年江苏省盐城市建湖县中考一模数学试题2023年吉林省松原市丰泽中学中考一模数学试题(已下线)专题07 四边形-学易金卷:2023年中考数学一模试题分项汇编(江苏专用)(已下线)2023年吉林省一模(几何探究题)
更新时间:2023-04-06 15:21:37
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相似题推荐
解答题-问答题
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【推荐1】特例发现:
如图1,点E和点F分别为正方形ABCD边BC和边CD上一点,当CE=CF时,则易得BE=DF,BE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/80ec1853-6240-4943-9bdc-2be1f7975706.png?resizew=416)
(1)如图2,点E为正方形ABCD内一点,且∠ECF=90°,CF=CE,点E,F在直线CD的两侧,连接EF,BE,DF,探究线段BE与DF之间的关系,并说明理由;
(2)如图3,在矩形ABCD中,AB∶BC=1∶2,点E在矩形ABCD内部,∠ECF=90°,点E,F在直线BC的两侧,CE∶CF=1∶2,连接EF,BE,DE,BF,DF.请探究线段DE,BF之间的关系,并说明理由;
(3)若(2)中矩形ABCD的边AB=3,Rt△CEF的边CE=1,当BE=DF时,求BF的长.
如图1,点E和点F分别为正方形ABCD边BC和边CD上一点,当CE=CF时,则易得BE=DF,BE⊥DF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/13/80ec1853-6240-4943-9bdc-2be1f7975706.png?resizew=416)
(1)如图2,点E为正方形ABCD内一点,且∠ECF=90°,CF=CE,点E,F在直线CD的两侧,连接EF,BE,DF,探究线段BE与DF之间的关系,并说明理由;
(2)如图3,在矩形ABCD中,AB∶BC=1∶2,点E在矩形ABCD内部,∠ECF=90°,点E,F在直线BC的两侧,CE∶CF=1∶2,连接EF,BE,DE,BF,DF.请探究线段DE,BF之间的关系,并说明理由;
(3)若(2)中矩形ABCD的边AB=3,Rt△CEF的边CE=1,当BE=DF时,求BF的长.
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【推荐2】在湘教版八年级下册数学教材第66页学习了以下内容:菱形的对角线互相垂直
【结论运用】
(1)如图①,菱形
的对角线
与
相交于点
,
,
,则菱形
的面积是 ;
(2)如图②,四边形
是平行四边形,点
在
上,四边形
是菱形,连接
.求证:
;
(3)如图③,四边形
是菱形,点
在
上,四边形
是菱形,连接
,若
,则
度.(直接写出答案)
【结论运用】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/30/79090ead-2756-4448-b947-a279ab7c92ff.png?resizew=440)
(1)如图①,菱形
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a442d8378128958ab12f64211c852f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图②,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caac78889e21a7aa302dfb59833ea48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
(3)如图③,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b07e65ef2032939b731005cfe208503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e218b2c53118f0fffac43fbde097f00e.png)
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【推荐1】【操作体验】
如图,在正方形
中,点
在
边上,点
在
边上.将四边形
沿直线
翻折,得到四边形
,顶点
落在
边上的点
(不与点
、
重合)处,点
落在正方形右侧的点
处,
与
相交于点
.
(1)在图1中,若
,
,则
______
,
的度数为____________
【操作体验】
(2)当
时,如图2,求证:
.
【操作体验】
(3)利用图3探究,当正方形边长不变时,随着折痕
的变化,
的周长是否会发生变化?如果会,请说明变化规律;如果不会,请加以证明,并探究正方形周长与
的周长的关系.
如图,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e826b8202fa0e17245dcc68426c923a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3354914d3a733d1483ce86567f9320a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42779f180e18631a621c16da39d319ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e2e2d053ef8b0207dcb8b581216b73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ebc2aee7d337c3f94f6e72b4d62304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ca0ea573af39647bbb44977ed1eeb2.png)
【操作体验】
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fbc3a1f1e848cf1349b9327be8607d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e59e0880d9b2280c550f7af9e70cab.png)
【操作体验】
(3)利用图3探究,当正方形边长不变时,随着折痕
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0da3dff109997a673a70ed024a9dbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0da3dff109997a673a70ed024a9dbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/27/a2af5b38-62d8-4fae-970c-c7b44f1ca700.png?resizew=472)
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解题方法
【推荐2】【方法回顾】
(1)如图1,过正方形ABCD的顶点A作一条直线l交边BC于点P,BE⊥AP于点E,DF⊥AP于点F,若DF=2.5,BE=1,则EF= .
![](https://img.xkw.com/dksih/QBM/2020/6/20/2488476487704576/2492522664534016/STEM/b5496571a656417f90eb17e2fcb5677d.png?resizew=432)
【问题解决】
(2)如图2,菱形ABCD的边长为1.5,过点A作一条直线l交边BC于点P,且∠DAP=90°,点F是AP上一点,且∠BAD+∠AFD=180°,过点B作BE⊥AB,与直线l交于点E,若EF=1,求BE的长.
【思维拓展】
(3)如图3,在正方形ABCD中,点P在AD所在直线上的上方,AP=2,连接PB,PD,若△PAD的面积与△PAB的面积之差为m(m>0),则PB2﹣PD2的值为 .(用含m的式子表示)
(1)如图1,过正方形ABCD的顶点A作一条直线l交边BC于点P,BE⊥AP于点E,DF⊥AP于点F,若DF=2.5,BE=1,则EF= .
![](https://img.xkw.com/dksih/QBM/2020/6/20/2488476487704576/2492522664534016/STEM/b5496571a656417f90eb17e2fcb5677d.png?resizew=432)
【问题解决】
(2)如图2,菱形ABCD的边长为1.5,过点A作一条直线l交边BC于点P,且∠DAP=90°,点F是AP上一点,且∠BAD+∠AFD=180°,过点B作BE⊥AB,与直线l交于点E,若EF=1,求BE的长.
【思维拓展】
(3)如图3,在正方形ABCD中,点P在AD所在直线上的上方,AP=2,连接PB,PD,若△PAD的面积与△PAB的面积之差为m(m>0),则PB2﹣PD2的值为 .(用含m的式子表示)
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名校
【推荐3】某研究性学习小组在探究矩形的折纸问题时,将一块直角三角板的直角顶点绕矩形
(
)的对角线的交点
旋转(![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef73aff3fe470e367f4af24fdfff3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef73aff3fe470e367f4af24fdfff3df.png)
),图中的
分别为直角三角形的直角边与矩形
的边
的交点.
解决问题:(
)该学习小组成员意外的发现图
(三角板一直角边与
重合)中,此时发现
这三条线段之间满足以下的数量关系:
;在图
中(三角板一边与
重合),
,请你对这名成员在图
和图
中发现的结论选择其一说明理由.
)在图
中(三角板一边与
重合),直接写出
这三条线段之间所满足的数量关系 .
在图
中,试探究
这四条线段之间的数量关系,写出你的结论,并说明理由.
拓展延伸:(
)将矩形
改为边长为
的正方形
,直角三角板的直角顶点绕
点旋转到图
,两直角边与
,
分别交于
,直接写出
这四条线段之间所满足的数量关系.(不需要证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef73aff3fe470e367f4af24fdfff3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef73aff3fe470e367f4af24fdfff3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eceff9b68796f5ccd4daa4028e3a182.png)
解决问题:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b81cfd2a2d61cd1f8e915788273e59f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b53802815a157146fc5c4ea1530903e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3341653861e0363f166435ad8106324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b81cfd2a2d61cd1f8e915788273e59f.png)
在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8443063f61fc96e23d25ae5e6754017.png)
拓展延伸:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/7d8b8edd94bc4d5d517ec77e56800e41.png)
![](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/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8443063f61fc96e23d25ae5e6754017.png)
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名校
【推荐1】如图①,点
为正方形
内一动点,且
,将
绕点
按顺时针方向旋转
,得到
,连结
,延长
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/85de1cd4-cee5-4fb8-ad56-2e62739388af.png?resizew=374)
(1)求证
.
(2)如图②,若
,请猜想线段
与
的数量关系并加以证明.
(3)如图①,若
,
,求出
的长.
(4)若正方形边长为
,直接写出
的最小值
用含
的代数式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b660034355c572fc7c9d89c7bec8e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d2094777538ba6a70ea65d5061ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/19/85de1cd4-cee5-4fb8-ad56-2e62739388af.png?resizew=374)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dcaa457ac52e1ca8292bdcd8d058682.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae48a456f61464c9bfb16e7f000db3af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5277c0885b8761ba66d40f66e7a8aa8.png)
(3)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd9d576c9596ab55839c40a42d63c46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc21d04f34e1427744fbfd9db96009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
(4)若正方形边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da971671378e8d40e15f5ef0b6e41467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
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【推荐2】已知Rt△ABC,两直角边AB与AC之和为4,作△ABC的外接圆,点O为圆心.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/8dfd3ae7-af00-4f44-91ca-afed97e1e1d4.png?resizew=730)
(1)如图1,连接OA,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
90°时,求OA的值.
(2)如图2,过点A作AD⊥BC于点D,点E为AC中点,连接DE,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
2∠ADE.
(3)如图3,作∠BAC的平分线交BC于点F,线段AF是否存在最大值?若存在,请求出AF的最大值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/22/8dfd3ae7-af00-4f44-91ca-afed97e1e1d4.png?resizew=730)
(1)如图1,连接OA,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f5ad9cc23a56d42746a29e34033831.png)
(2)如图2,过点A作AD⊥BC于点D,点E为AC中点,连接DE,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f5ad9cc23a56d42746a29e34033831.png)
(3)如图3,作∠BAC的平分线交BC于点F,线段AF是否存在最大值?若存在,请求出AF的最大值;若不存在,请说明理由.
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【推荐3】【问题背景】小初同学在学习圆周角时了解到:圆内接四边形的对角互补.
如图①,点
、
、
、
均为
上的点,
,则有
______°;
【问题探究】爱思考的小初同学发现:如图②,点
,
,
,
均为
上的点,若
,点
为弧
上任意一点(点
不与点
、
重合),若点
在运动的过程中始终保持
,则
的度数恒为
.
下面是小初的证明过程:
证明:延长
至点使
,连接
.
缺失(1)
在
与
中,
,
∴
.
∴
,
,
,
又
,
∴
,
∴
,
∴
为等边三角形.
缺失(2)
请你补全缺失的证明过程.
【结论应用】如图③,点
,
,
,
均为
上的点,若
,点
为弧
上任意一点(点
不与点
、
重合),且
,
的半径为2,当点
在运动的过程中,四边形
的周长的最大值为______.
如图①,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971186a68d48dbb81b3ca1f2a0ec0f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db90c0feb35aa54464f1303be9118f37.png)
【问题探究】爱思考的小初同学发现:如图②,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/5bc93442cc086b44fc67907aac067d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
下面是小初的证明过程:
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a3a922f7ea64083c415c72259179a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
缺失(1)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4c625a55ef1d2920a0605d52c8da23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c941cb13f64020851fd09e0514f2502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8573ec93f55c65529008897713a65539.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b28d708b000067e25f3df570eb2a92.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ac49caae8e3b8869d19beeff98966e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a3a922f7ea64083c415c72259179a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ce956bc96a1eb7bae2ad10879fbaeee.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc93442cc086b44fc67907aac067d3c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5144f280c283f799ae4e51192cdfc38.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf4006da017dfa3f699c39ad0a24fbb.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b59f79992d67ee52d205537728f2745.png)
缺失(2)
请你补全缺失的证明过程.
【结论应用】如图③,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc0b376ea9c9e8f28c6c03b83d9467b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】教材中有这样一道题:如图①所示,四边形
是正方形,G是
上的任意一点,
于点E,
,且交
于点F.求证:
.
小明通过证明
解决了问题,在此基础上他进一步提出了以下问题,请你解答.
(1)若图①中的点G为
延长线上一点,其余条件不变,如图②所示,猜想此时
之间的数量关系,并证明你的结论;
(2)将图①中的
绕点A逆时针旋转,使得
与
重合,记此时点F的对应点为点
,如图③所示,若正方形的边长为6,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd99874843902d155f3f9dc26b924f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daee8baa62b5b8d5db41eab0d360ee51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df0a32a119ffb52f3d288071c3e94d58.png)
小明通过证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6289f82472eec6b8c47b883a55f9ec32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/7b063180-fbd9-478c-b302-956b08139e2b.png?resizew=462)
(1)若图①中的点G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f90f69d449e48719948ba60c9e04a8d.png)
(2)将图①中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
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【推荐2】二次函数
的图象经过点
,与
轴分别交于点
,点
.点
是直线
上方的抛物线上一动点.
(Ⅰ)求该二次函数的解析式;
(Ⅱ)连接
,
,将
沿
轴翻折,得到
.当四边形
为菱形时,求点
的坐标;
(Ⅲ)当四边形
的面积
最大时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96dde9c4aad0536c069127df0d4b12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(Ⅰ)求该二次函数的解析式;
(Ⅱ)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/847f3efe1ed0442eeaef93c89439c581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca08aff081531f99cdee640ca4677f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85ef67d769dd41ac295abf1f53f4d4c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(Ⅲ)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31c168b883daa13e8a284c1770527b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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