如图,已知
的角平分线
与
边的垂直平分线相交于点
,过点
分别作
的垂线,垂足分别为点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/13/b50a529f-566b-40e6-9bab-931100fffdaa.png?resizew=146)
更新时间:2024-02-13 14:26:46
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】综合与实践课上,老师让同学们以“正方形的折叠”为主题开展数学活动,有一位同学操作过程如下:
操作一:对折正方形纸片
,使
与
重合,得到折痕
,把纸片展平;
操作二:在
上选一点P,沿
折叠,使点A落在正方形内部点M处,把纸片展平,连接
、
,延长
交
于点Q,连接
.
上时,
______度;
(2)如图2,改变点P在
上的位置(点P不与点A,D重合).
①判断
与
的数量关系,并说明理由;
②若
,
(点Q在
下方),则
的长为______.
操作一:对折正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/49b50357a6545cae8348e3059312f520.png)
操作二:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5521d0070aa23dc0fe22956cc35ee3.png)
(2)如图2,改变点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cd4848ce65d25d3bb30a725322ca8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33149bfd164e70c6743fa0c97e9a897f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc5c276923c1a46eaf18193604fdb6b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,
.
(1)尺规作图:在图1中,作
的平分线
交BC于点D(不写作法,保留作图痕迹);
(2)如图2,在(1)的条件下,过点D分别作
,
,垂足分别为E,F,连接
,
与
相交于点G.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)尺规作图:在图1中,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/555c8eb0-5d3d-4ba0-b405-c87238ffc0c1.png?resizew=335)
(2)如图2,在(1)的条件下,过点D分别作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b731c2724383ea2a4432ef5ef06caf8b.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
为
的平分线,
于点E,
于点F.
(1)求证:
是
的垂直平分线;
(2)若
的面积是
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/10/9c09a414-8e10-49be-80a0-c10bf0a2ee5e.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9202af84bc055b58bd51fae5e3272283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818309e7b9a67c54ab1530fdb4b0edc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,
,
平分
.将一块足够大的三角尺的直角顶点落在射线
的任意一点
上,并使三角尺的一条直角边与
(或
的延长线)交于点
,另一条直角边与
交于点
.
![](https://img.xkw.com/dksih/QBM/2019/9/16/2291829219631104/2291863063330817/STEM/b9b9f626b6fb495b81a89e275a13216f.png?resizew=490)
(1)如图1,当
与边
垂直时,证明:
;
(2)如图2,把三角尺绕点
旋转,三角尺的两条直角边分别交
于点
,在旋转过程中,
与
相等吗?请直接写出结论:
(填
,
,
),
(3)如图3,三角尺绕点
继续旋转,三角尺的一条直角边与
的延长线交于点
,另一条直角边与
交于点
.在旋转过程中,
与
相等吗?若相等,请给出证明;若不相等,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2491096b26eeaa5072f40a16635bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2019/9/16/2291829219631104/2291863063330817/STEM/b9b9f626b6fb495b81a89e275a13216f.png?resizew=490)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374e2198b495b86b0f8308d28035a3db.png)
(2)如图2,把三角尺绕点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739ac456da45baf5f103ba376ae88058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(3)如图3,三角尺绕点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/df77a3df-1474-4f1f-ad8c-1c3a0b90ebe5.png?resizew=153)
(1)用尺规完成以下基本作图:作线段
的垂直平分线l,交线段
于点D,交
于E,连接
(不说明理由,只保留作图痕迹);
(2)在(1)所作的图形中,求证:
.
小明的思路是这样的:由中垂线的性质得到
,从而得到
,再证
,从而证得
,最后等量代换可得
.请根据这个思路补全下面的证明过程.
证明:
∵直线l是线段
的垂直平分线,且点E在直线l上 ∴ ① ∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897c3bec4b7e2be338c6faf41442f27d.png)
∵
∴
∴ ② ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9811b25b7f45e927c8dd4243603ee392.png)
∵
∴ ③ ∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062eeae4f31172ec99c10edc25697cad.png)
∵
∴ ④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/df77a3df-1474-4f1f-ad8c-1c3a0b90ebe5.png?resizew=153)
(1)用尺规完成以下基本作图:作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在(1)所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
小明的思路是这样的:由中垂线的性质得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd260fb9d772c122dcb1df52cbe38ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897c3bec4b7e2be338c6faf41442f27d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57cb0d726cc25a350dc792b539ff2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3a6dcaf9f9e9a940b4a16f7ec2fc2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc1a8e1de618493faf62d1e75638a49.png)
证明:
∵直线l是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897c3bec4b7e2be338c6faf41442f27d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04234562e00479001573e570dd9ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9811b25b7f45e927c8dd4243603ee392.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18f29e6ae6320b6606a95303b330b474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/062eeae4f31172ec99c10edc25697cad.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c85049d1b45d788355df9f18fb38761.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,DM,EN分别垂直平分AC和BC,交AB于M,N两点,DM与EN相交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/e2672d11-e65c-407f-a8dd-8452fc1d10a6.png?resizew=265)
(1)若
,求
的度数;
(2)若
的周长为
,求AB的长;
(3)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/e2672d11-e65c-407f-a8dd-8452fc1d10a6.png?resizew=265)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1be17e0a3e51cde1f50f384198e71e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f8eff113ca3f0d0200253c7c2f5a7a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/587b2d7db939bddb7be0c313eb8ae16f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a5a042072cc1e0983faf4c2b0a8a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f8eff113ca3f0d0200253c7c2f5a7a.png)
您最近一年使用:0次