如图所示,在矩形ABCD中,点E在AD边上,EF⊥BE交CD于点F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73a20b9314f2faed0cf5089feb34ef0.png)
![](https://img.xkw.com/dksih/QBM/2022/4/5/2951517369548800/2973633887182848/STEM/c4cca3bd-e3e1-4f42-a989-8187eee6b034.png?resizew=161)
更新时间:2022-05-06 16:56:32
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【推荐1】如图,平行四边形
的对角线
、
交于点O,E为
中点,过点O作
交
的延长线于H,连接
与
.
;
(2)当四边形
是怎样的特殊四边形时,四边形
为菱形?请说明理由.
![](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/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b08f9ce1aa875b756cc857cdc0e7d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c63ddb5bdcfa94318b2109a7ec0f963.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a77e32ed3aa8b02a1502382d564192.png)
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【推荐2】如图,矩形ABCD中,点E,F分别在边AB,CD上,点G,H在对角线AC上,EF与AC相交于点O,AG=CH,BE=DF.
![](https://img.xkw.com/dksih/QBM/2019/9/15/2291445189632000/2291920199294976/STEM/0047f0a715c44737aba2c4f899339491.png?resizew=185)
(1)求证:四边形EGFH是平行四边形;
(2)当EG=EH时,连接AF
①求证:AF=FC;
②若DC=8,AD=4,求AE的长.
![](https://img.xkw.com/dksih/QBM/2019/9/15/2291445189632000/2291920199294976/STEM/0047f0a715c44737aba2c4f899339491.png?resizew=185)
(1)求证:四边形EGFH是平行四边形;
(2)当EG=EH时,连接AF
①求证:AF=FC;
②若DC=8,AD=4,求AE的长.
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【推荐1】如图,
是半圆
的直径,点
是
延长线上 一点,
是⊙
的切线,切点为
,过点
作
交
的延长线于点
,连接
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/549d32f8-4515-4467-a16e-64998f618671.png?resizew=237)
(1)
.
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/549d32f8-4515-4467-a16e-64998f618671.png?resizew=237)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a79d56c74469f878c60c2d479e15932.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8295f0a59ad97161cbfddd55645c0feb.png)
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【推荐2】如图,在四边形
中,
,对角线
交于点
平分
,过点
作
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/c7af7ec0-65e2-4d00-bcbf-a7f681af2783.png?resizew=264)
(1)求证:四边形
是菱形.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/416e449de9bbe3c7b76086408e6a2aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875b90470f7c0e85c988b0cc12aca03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/10/c7af7ec0-65e2-4d00-bcbf-a7f681af2783.png?resizew=264)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65646d3100e5cfea973c87a0b5871295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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