1 . 如图1,在边长为5的正方形
中,点
、
分别是
、
边上的点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/74758542-13e6-46a0-a0cf-facbaf40a68b.png?resizew=236)
(1)求
的值;
(2)延长
交正方形外角平分线
于点
(如图2),试判断
与
的大小关系,并说明理由;
(3)若将“边长为5的正方形”改为“
长为
,
长为
,的矩形”,其他条件不变,试判断
与
的大小关系,并说明理由.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce726bceb02452bb4e5ed6b00fa94e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/74758542-13e6-46a0-a0cf-facbaf40a68b.png?resizew=236)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e68db09c01677da8add3fd62821e903.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
(3)若将“边长为5的正方形”改为“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aecabe63b4226b128dd88235d4f3f224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce9de25ba46bc17e9598ba655e98b48e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
您最近一年使用:0次
2 . 如图1,在矩形
中,E为
延长线上一点,且
,
交
于点F,
.
(1)求证:
;
(2)求证:
;
(3)如图2,G为
上一点,
,
相交于点O,连接
.若
,且
,求
的长.
![](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/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/4356d7aa-bd53-4134-a291-4938a156c532.png?resizew=280)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d390df2733a81db86f0556dba8af0f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db827cbb22a564c4dbaa6e1c78c6dae5.png)
(3)如图2,G为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482d66b7dddfcb7db44c746f11a32ed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8416b9c7e23d5f090b08c1adaadffc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
3 . 如图,在正方形
中,
,点P是CD边上的一点(点P与点C、D不重合),连接
,点M、N分别在
、
边上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/4968fced-b4b9-41c3-a355-44d062d5eb88.png?resizew=469)
(1)如图1,判断线段
、
的数量关系,并说明理由;
(2)如图2,当
恰好经过正方形
的中心O时,求四边形
的面积;
(3)如图3,当
恰好经过线段
的中点E时,则点
为何值时,四边形
的面积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1fc95a7d8996ebdf0494061098bd1b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcabbb4a3204d94675ce39838e13c3af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/4968fced-b4b9-41c3-a355-44d062d5eb88.png?resizew=469)
(1)如图1,判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515f2668c6ab5e6d0679218ea9c8e4be.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/515f2668c6ab5e6d0679218ea9c8e4be.png)
您最近一年使用:0次
名校
4 . 如图,D是
内一点,P是边
上一点,
和
均为等腰直角三角形,其中
,
,
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d8b45ff5-bba8-4133-80b6-450caf05f483.png?resizew=127)
(1)求证:
;
(2)若
,
,求
的长;
(3)若
,则求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7f9f7952c4be18cb73393047c2ad75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17c736af77b3b3be66a4243815fe4521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300ee27f04188cb8ee5e20394c8f50fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/11/d8b45ff5-bba8-4133-80b6-450caf05f483.png?resizew=127)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a15a004f7d47ed595f063e60075223a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b1a63a6586beb65cb2e7652411bb696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
您最近一年使用:0次
5 . 已知E是矩形
的边
上的一点.
,若四边形
是正方形,
交
于点
,求证;
;
(2)已知
,
,
分别交
,
于
,
两点,且
平分矩形
的面积.
如图2,若
,求
的长;
如图3,
与
交于点
,连接
,求出线段
长的最小值.
![](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/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.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/04f8eebda19eded2b059774a8c2666c3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629f4755f4ffb6c1556579365b88c2b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ee3e567700c1d5b17944ffc6229c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
2023-11-05更新
|
304次组卷
|
2卷引用:2022年湖北省宜昌市五峰土家族自治县中考模拟数学试题
名校
6 . 如图,在正方形
中,点
在
延长线上,点
在
上,连接
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/c277ec88-f952-49ce-99a5-19433a6c089f.png?resizew=375)
(1)如图1,求证:
;
(2)如图2,过点A作
平分
交
于点
,连接
,过点
作
交
于点
分别交
于点
,请直接写出图中始终与
相等的角(
除外)
![](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/6b1bd1adfe4cc6566218f19970c2fd3b.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/a26260c10afb34f543d86b67898134f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d6b9ccc3a025e4f11717cfd7ab354b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/c277ec88-f952-49ce-99a5-19433a6c089f.png?resizew=375)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)如图2,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba4c66af41c3a4729b3a5f9e98fc43db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034bb31ac832fd4a97f39b52e0af56e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab9c1c37a80bdca8ac7971fac09d7e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0f067a2a348ceb24a408f82992eab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
您最近一年使用:0次
7 .
内接于
,
是
的直径,
垂直于
的平分线于点E.
(1)如图1,求证:
;
(2)如图2,过点C作
交
于点D.求证:
;
(3)如图3,在(2)的条件下,M为
中点,延长
交
于点N,连接
,若
,求
的值.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/fe2dbb47-ba14-4973-ab28-f51bb6aa139a.jpg?resizew=385)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945b48caa0d7f4ca383053a98d0e9bc4.png)
(2)如图2,过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf639610c57081b951dcbf704ea6996.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0fb1895dee982e73f1868094570227.png)
(3)如图3,在(2)的条件下,M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9af0d5df6e3951981336cf445e6b46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6029b7b7022d1f5e8773507e4792df4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4929bfd2e363759bb88b8c0e2ad11599.png)
您最近一年使用:0次
8 . 如图,在⊙
中,
是直径,点
是⊙
上一动点,连接
,沿
将
翻折,交过点
的切线
于点
,交⊙
于点
.
(1)求
的度数;
(2)若
半径为7,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/915b7944-e713-4787-bfd1-0044aa7bf7c1.jpg?resizew=155)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b2b77220886ec01700e01eea61333b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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9 . 如图,四边形ABCD是菱形,对角线AC、BD相交于点O,点E是CD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/8550b047-877d-4370-bccf-7d08cfdf276a.png?resizew=227)
(1)用直尺和圆规完成下面的作图,过点C作AC的垂线,与OE的延长线交于点F,连接FD:(只保留作图痕迹)
(2)求证:四边形OCFD是矩形.
证明:∵四边形ABCD是菱形.
∴
,
∴
,
又∵
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23d90078fcdfde7e9f221bc2bebda3a.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c814216019866ec93cb73d6c26cebc3.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
∴___________①___________,
∵E是CD中点,
∴___________②___________,
在△ODE和△FCE中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a1537865835d2b99ad2a4aeeb6948d.png)
∴
,
∴___________③___________,
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
∴四边形OCFD是平行四边形,
又∵___________④___________,
∴四边形OCFD是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/8550b047-877d-4370-bccf-7d08cfdf276a.png?resizew=227)
(1)用直尺和圆规完成下面的作图,过点C作AC的垂线,与OE的延长线交于点F,连接FD:(只保留作图痕迹)
(2)求证:四边形OCFD是矩形.
证明:∵四边形ABCD是菱形.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cc88685997c7586d1d4bf75a055433.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b5e92a1b3ce124d436df24a8ca3b30.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23d90078fcdfde7e9f221bc2bebda3a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c814216019866ec93cb73d6c26cebc3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
∴___________①___________,
∵E是CD中点,
∴___________②___________,
在△ODE和△FCE中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a1537865835d2b99ad2a4aeeb6948d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636fb44de571f94662bc9fd168cd196d.png)
∴___________③___________,
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4ed367926376b17f6bef079644ea79.png)
∴四边形OCFD是平行四边形,
又∵___________④___________,
∴四边形OCFD是矩形.
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10 . 如图,在同一平面内,小颖同学用一个含有
的直角三角板靠紧墙角两边滑动,经过她的研究发现:①点C到墙壁、地面的距离总能保持相等;②斜边
的中点O到两直角顶点的距离也能保持相等.(其中
、
、
)作
于E,
于F,请根据下面问题给出你的解答:
(1)求证:
.
(2)求证:四边形
是正方形.
(3)连接
,求证:
.
(4)当
、
时,求三角板的直角边
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cfd06965af6014208127f2880b476b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aac18b0388014ae20b2add2975ef56aa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/83adb4c4-2e42-4eb6-8705-b0138aad8fca.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02820d6c8dfc295d60dcfcd95b30a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
(4)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50f357512a4b05fd9e79a315041d22e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/070bc896d35495237fd65576e9b6f88e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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