已知线段
,点C 是平面内一动点,且
,连接
,将线段 BC绕点 B顺时针旋转
得到线段
, 连接
,
交
于点 E.
(1)如图1, 若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
①求
的度数;
②如图2,作
的角平分线
交
于 F,试探究线段
与
之间的数量关系,并说明理由;
(2)若
, 当
最长时, 求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90227acf6ca686cd1dbd1dd556f1eb10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86b0118d4adeaf60493d13854fffc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/8d98a2d9-3fe2-4235-a3d7-ef5b29870d89.png?resizew=382)
(1)如图1, 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
②如图2,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/763fa15748b8619cc007630542046edd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2024-03-14 15:56:13
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,AB⊥BC于点B,CD⊥BC于点C,点E在线段BC上,且AE⊥DE.
(1)求证:∠EAB=∠CED;
(2)如图2,AF、DF分别平分∠BAE和∠CDE,则∠F的度数是 (直接写出答案即可);
(3)如图3,EH平分∠CED,EH的反向延长线交∠BAE的平分线AF于点G.求证:EG⊥AF.(提示:三角形内角和等于180°)
(1)求证:∠EAB=∠CED;
(2)如图2,AF、DF分别平分∠BAE和∠CDE,则∠F的度数是 (直接写出答案即可);
(3)如图3,EH平分∠CED,EH的反向延长线交∠BAE的平分线AF于点G.求证:EG⊥AF.(提示:三角形内角和等于180°)
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解题方法
【推荐2】已知Rt△ABC中∠C=Rt∠,且BC=9,∠B=30°.
(1)如图1、2,若点D是CB上一点,且CD=3,点E是AB上的动点,将△DBE沿DE对折,点B的对应点为B′(点B′和点C在直线AB的异侧),DB′与AB交于点H.
①当∠B′EA=20°时,求∠EDB的度数.
②当△B′HE是等腰三角形时,求∠DEB的度数.
(2)如图2,若点D是CB上一点,且CD=3,M是线段AC上的动点,以∠MDN为直角构造等腰直角△DMN(D,M,N三点顺时针方向排列),在点M的运动过程中,直接写出CN+NB的最小值.
(1)如图1、2,若点D是CB上一点,且CD=3,点E是AB上的动点,将△DBE沿DE对折,点B的对应点为B′(点B′和点C在直线AB的异侧),DB′与AB交于点H.
①当∠B′EA=20°时,求∠EDB的度数.
②当△B′HE是等腰三角形时,求∠DEB的度数.
(2)如图2,若点D是CB上一点,且CD=3,M是线段AC上的动点,以∠MDN为直角构造等腰直角△DMN(D,M,N三点顺时针方向排列),在点M的运动过程中,直接写出CN+NB的最小值.
![](https://img.xkw.com/dksih/QBM/2021/12/8/2867909817344000/2869461092163584/STEM/a177730b-a078-4d23-84ac-286f08997768.png?resizew=511)
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【推荐1】综合与实践课上,诸葛小组三位同学对含60°角的菱形进行了探究.
【背景】在菱形
中,
,作
,
、
分别交边
、
于点P、Q.
(1)【感知】如图1,若点P是边
的中点,小南经过探索发现了线段
与
之间的数量关系,请你写出这个关系式 .
(2)【探究】如图2,小阳说“点P为
上任意一点时,(1)中的结论仍然成立”,你同意吗?请说明理由.
(3)【应用】小宛取出如图3所示的菱形纸片
,测得
,
,在
边上取一点P,连接
,在菱形内部作
,
交
于点Q,当
时,请直接写出
的面积.
【背景】在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38c680c5e93b6e54af6e1b1dc252ec4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/1/7ce6ffd5-54b9-481d-81e7-0eb13228a7ad.png?resizew=580)
(1)【感知】如图1,若点P是边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
(2)【探究】如图2,小阳说“点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)【应用】小宛取出如图3所示的菱形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30a97b183d5fd1a76d87eb07436bb4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49954888d029e06d94e7b6b03f1ff09f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41984f53bb280ba8b5ac00a52ce2825.png)
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【推荐2】已知四边形
是正方形,点E在直线
上,连接
,过点E作
的垂线,交直线
于点F,交直线
于点G.
![](https://img.xkw.com/dksih/QBM/2022/6/1/2991846798155776/2992677336825856/STEM/312b3fc5-f70f-49f9-884b-04b56ffd0978.png?resizew=604)
(1)如图1,当点E在线段
上时,请直接写出线段
之间的数量关系;
(2)如图2,当点E在线段
的延长线上时,(1)中的结论是否成立,若成立,请完成证明,若不成立请写出你的结论并说明理由:
(3)若
,请直接写出
的值.
![](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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2022/6/1/2991846798155776/2992677336825856/STEM/312b3fc5-f70f-49f9-884b-04b56ffd0978.png?resizew=604)
(1)如图1,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bf86498fc9de99d442d26548f5e10e.png)
(2)如图2,当点E在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8988347507dff5b4e4953c5f6e04112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be31b4194df3a2f14e2b7fc6261a8dec.png)
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【推荐1】已知在
中,
,CA=CB,点D是AB的中点.直线M经过点C,与边AB交于点E.
⑴如图1,过点
作直线
的垂线,垂足为点
,交
于点
,求证:
;
⑵如图2,过点
作直线
的垂线,垂足为点
,交
的延长线于点
,求证:
;
⑶如图3,点
在直线
上,
,
,当
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9178fc8b5d65aa75fa9196294a0db7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11161893fcdaa8afaf472ebd6ff1e878.png)
⑴如图1,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d412c98abdbee613dbfd40aa7f0aa23.png)
⑵如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb490b89156ff5d7ddd89a07a23225b.png)
⑶如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8617ef6d6294ec9cec96439a8c3395da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0dc475c3748182b784604ef676c561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2363dc9db48961f3f7cab7448fb074.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee245fb019660ced8453670e1042a98.png)
![](https://img.xkw.com/dksih/QBM/2019/3/18/2163014385762304/null/STEM/d427e721023c4ef0a73095e46d130c59.png?resizew=430)
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名校
【推荐2】如图1,在四边形ABCD中,AB=AC,∠BAC=60°,∠B+∠C+∠ADB=4∠BAC,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c26dae76-90e8-401f-8929-f4849945f157.png?resizew=360)
(1)求∠ADC的度数;
(2)如图2,若AD=BD+CD,求证:AD平分∠BDC;
(3)如图3,在(2)的条件下,E、F分别在AC、AB上,交于点P,使得∠BPC=∠BDC,若BD=EF=7,AD=15,求△EFP的⾯积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c26dae76-90e8-401f-8929-f4849945f157.png?resizew=360)
(1)求∠ADC的度数;
(2)如图2,若AD=BD+CD,求证:AD平分∠BDC;
(3)如图3,在(2)的条件下,E、F分别在AC、AB上,交于点P,使得∠BPC=∠BDC,若BD=EF=7,AD=15,求△EFP的⾯积.
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【推荐1】已知如图,
是
的角平分线,且
于点
.
(1)如图1,求证:
;
(2)如图2,
,点
在
上,连接
并延长交
于点
,
交
的延长线于点
,
,连接
,
,
的面积是
的面积的
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/0a3c946e-59ba-47d7-a058-27450fe35b7f.png?resizew=351)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.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/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76b8cae5e5b38478a894d2ef5d12a1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6cee83d36c4da913e0790e5070c46f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc727c642cbc2181476b7dd8eca471e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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真题
【推荐2】如图,
是
的角平分线, 延长
交
的外接圆
于点
,过
三点的圆
交
的延长线于点
,连结
.
(1)求证:
∽
;
(2) 若
, 求
的长;
(3) 若
∥
, 试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfa1efa3490a7d6cd8621535b2067ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d89c245336052ef5d2a5214f39d5f58.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425e79e4e7c13e2ea8ae3d4f8d31ac33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/556f6db0a23accae274d176616ea86fe.png)
(2) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02b570040e00764979c3f379b98cc5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3) 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73d6dde62cacc0d1fc589d3f1565304.png)
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573516092620800/1573516200157184/STEM/16e5ad42abf74ca594ca9cd5b268fd09.png)
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