如图1,在正方形ABCD中,P为对角线BD上的一点,点E在AD的延长线上,且
,PE交CD于F,连结CE.
(1)求证:
;
(2)求证:
是等腰直角三角形;
(3)如图2,把正方形ABCD改为菱形ABCD,其他条件不变,当
时,判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef227e3c17e425d6809b50489f83f50b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35917c8bdaa05de09313ac50ffdfdbb2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
(3)如图2,把正方形ABCD改为菱形ABCD,其他条件不变,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://img.xkw.com/dksih/QBM/2020/7/20/2510049008050176/2510794386137088/STEM/da44849a78214fd4a401e575ff8609ce.png?resizew=404)
更新时间:2020-07-21 18:47:09
|
相似题推荐
解答题-证明题
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【推荐1】如图,在平行四边形ABCD中,点E、F分别在AB、CD上,且AE=CF.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925678424064/2989773625262080/STEM/a9d14b10061d469f810cdb30feec3f4b.png?resizew=206)
(1)求证:DE=BF;
(2)若DF=BF,求证:四边形DEBF为菱形.
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987925678424064/2989773625262080/STEM/a9d14b10061d469f810cdb30feec3f4b.png?resizew=206)
(1)求证:DE=BF;
(2)若DF=BF,求证:四边形DEBF为菱形.
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【推荐2】如图,在平行四边形ABCD中,对角线AC、BD相交于点O,以AC为斜边的等腰直角三角形AEC的边CE与AD交于点F,连接OE,使得
.在AD上截取
,连接EH、ED.
(1)判断四边形ABCD的形状,并说明理由;
(2)若
,
,求EH的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59182f25fcf22afc79e28ded936de018.png)
(1)判断四边形ABCD的形状,并说明理由;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853326565801984/2863222341156864/STEM/d0f7cf77-29ea-4dd0-b8aa-c571e5eea99d.png?resizew=188)
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【推荐1】如图,在
中,
、
相交于点O,点E、F在
上,
.
(1)求证:四边形
是平行四边形;
(2)若
,
,求证:四边形
是正方形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/9/5c47fe02-c784-4447-92c7-ba866f3763e4.png?resizew=172)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b0f0cdb98fe345dccfa96b3be72b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cd91b7c5ead4d850879e9422273600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
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名校
【推荐2】如图,
是
的内接三角形,
是
的直径,
平分
,交
于点
,交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498577032216576/2498857466421248/STEM/4c03d50b-5a23-478d-933d-1271a4977c25.png?resizew=195)
求证:
;
①当四边形
为平行四边形时,
的长为 ;
②若
,则
的长为 (结果保留
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37767023d2b05f8d90b2870e82d37880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/7/4/2498577032216576/2498857466421248/STEM/4c03d50b-5a23-478d-933d-1271a4977c25.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ea73685d1fbb544ac20c78c4412137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fdb48aaf0f4a2451390d27fb5f510a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f34f55889ebc0f945270beb94f98b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,已知正方形
是对角线
上任意一点,
,
,垂足分别为点
和
交
于点
.
(1)求证:四边形
是正方形;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/462d9d51496fa5250f55e7368111e056.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499f22283744d2e7cc62bc6461ac92fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500315d8852acb49612cca4dc35042b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/20b68129-38af-494f-bd98-4a28c674162d.jpg?resizew=163)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc4e13d764093a3e9cb02ce82987152.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106fa3633a78f4f3d64d726cda371a51.png)
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【推荐2】感知:如图①,在正方形ABCD中,点E在对角线AC上(不与点A、C重合),连结ED,EB,过点E作EF⊥ED,交边BC于点F.易知∠EFC+∠EDC=180°,进而证出EB=EF.
探究:如图②,点E在射线CA上(不与点A、C重合),连结ED、EB,过点E作EF⊥ED,交CB的延长线于点F.求证:EB=EF
应用:如图②,若DE=2,CD=1,则四边形EFCD的面积为
探究:如图②,点E在射线CA上(不与点A、C重合),连结ED、EB,过点E作EF⊥ED,交CB的延长线于点F.求证:EB=EF
应用:如图②,若DE=2,CD=1,则四边形EFCD的面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/ace97f6d-8005-43fd-b66f-feca7c9c2515.png?resizew=295)
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【推荐1】如图,平行四边形
中,连接
,过
作
于
,延长
与
交于
.
若
,求
的面积;
若
,过
作
于
,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ddff5a7241d9ea23fc970ab4301e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375e00fb6655711f58d100923d3d14db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c3c8cc8741df2b5d92c70c67b5dbca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf0db6853a914da88c714272ab5b037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2c49bebafbec89ae7366ef2952078b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/330c4293cc1e60d303d90ebd035c4498.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189259320467456/2190214188318720/STEM/f6a84baeba62430698eea36009cb4984.png?resizew=218)
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解答题-证明题
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【推荐2】将等腰三角形
折叠,使顶点
与底边
的中点
重合,折线分别交
、
于点
、
,连接
、
.
(1)如图1,求证:四边形
是菱形;
(2)如图2,延长
至点
,使
,连接
,并延长
交
的延长线于点
,在不添加任何辅助线的情况下,请直接写出图2中的所有平行四边形(不包括以
为一边的平行四边形)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)如图1,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466a12cf2d11494ec4f7173e904932a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/f0da1238-4b04-4f74-b43b-b6863266b07b.png?resizew=167)
(2)如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2609d0e7fe9a4f1e460d3276c23f86.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/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/4d1ab3a8-de9c-4230-82f2-c022bf06050b.png?resizew=187)
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