如图,在
中,
,
,D是边
的中点,
交
于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/3edc27c1-0cb9-41f5-80a0-7f5801d2ac5a.png?resizew=198)
(1)求
的度数;
(2)过点C作
垂直于
,垂足为点F,如果
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdc5c5356ec37800b9e71ee1ad5cca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/3edc27c1-0cb9-41f5-80a0-7f5801d2ac5a.png?resizew=198)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
更新时间:2023-09-16 09:49:41
|
相似题推荐
解答题-证明题
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适中
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【推荐1】如图,在
中,
,
,
是边
上的中线,
,
.
(1)求证:四边形
是菱形;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.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/542b5bc10c7341c04c22244f3ec16e6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/51df6b65-2820-4353-a715-c1da94c7f892.png?resizew=264)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
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解题方法
【推荐2】如图,已知四边形
为
的内接四边形,对角线
、
交于
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458881970077696/2460280152104960/STEM/537c5b41f0224185ac4ba0ff8e7ab340.png?resizew=409)
(1)求证:
;
(2)作
的角分线
交
于点
,连接
,若
,连接
、
,
与
交于
,求证:
;
(3)在(2)的条件下,连接
,延长
交
于点
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e294887ab065cedf03b77f49292bc6a9.png)
![](https://img.xkw.com/dksih/QBM/2020/5/9/2458881970077696/2460280152104960/STEM/537c5b41f0224185ac4ba0ff8e7ab340.png?resizew=409)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
(2)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c014ce99fac0db5a323db54a3211e5ae.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e7202a721398aa95ed33b74151e044.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbd051fedb6691e2183e658f1fe487ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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【推荐1】问题:如图1,在
中,
,
,点D是边
上任意一点,
是等边三角形,且点E在
的内部,连接
探究线段
与
之间的数量关系,请你完成下列探究过程;先将图形特殊化,得出猜想,再对一般情况进行分析并加以证明.![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/3da475c9-c542-42d0-b0ba-814c8fe9bde1.png?resizew=583)
(1)当点D与点C重合时(如图2),请你补全图形.由
的度数为___________,点E落在___________,容易得出线段
与
之间的数量关系为___________
(2)当点D是
上任意一点(不与点B,C重合)时,结合图1,研究(1)中线段
与
之间的数量关系是否与成立,并证明你的结论;
(3)如图3,在直线
上有一点P,使
为等腰三角形,请找出这样的点P,并直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58899f5c3638f1e32274137723f99836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/3da475c9-c542-42d0-b0ba-814c8fe9bde1.png?resizew=583)
(1)当点D与点C重合时(如图2),请你补全图形.由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)当点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)如图3,在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
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解答题-作图题
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【推荐1】如图,四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920418720243712/2971309965295616/STEM/d6608e16e70b4b178ce2e7c8a50e8f0d.png?resizew=162)
(1)求作
垂直平分线
,分别交
,
于点
,
(要求:尺规作图,保留作图痕迹,不写作法);
(2)在(1)的条件下,连接
,
.若
,
,请判断
是什么形状?并说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/2/20/2920418720243712/2971309965295616/STEM/d6608e16e70b4b178ce2e7c8a50e8f0d.png?resizew=162)
(1)求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b0907dd4ca05c9733b23f552b5226f.png)
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【推荐2】如图,抛物线y=ax2+bx+c的顶点为C(1,4),交x轴于点A(3,0),B两点,交y轴于点D.
(1)求点B、点D的坐标,
(2)判断△ACD的形状,并求出△ACD的面积.
(1)求点B、点D的坐标,
(2)判断△ACD的形状,并求出△ACD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/384f0f39-5677-4c09-bb1f-2309500138b1.png?resizew=161)
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【推荐1】教材呈现:如图是华师版九年级上册数学教材第78页的部分内容.
请根据教材提示,结合图①,写出完整的证明过程.
证明:连接
.
结论应用:
(1)如图②,在
中,
,
,
、
分别是边
、
的中点,
、
相交于点
.若
,则
.
(2)如图③,在
中,
、
分别是边
、
的中点,
、
相交于点
.过点G作
交AB于点F,如果
的面积是9,那么
的面积是 .
例2如图,在![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 求证: ![]() 证明:连接 ![]() ![]() |
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/23525fe2-17d7-4502-b6e6-9930e585503f.jpg?resizew=400)
结论应用:
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40ae5c98332fb15b2ef7250129b85cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95a2a2d3ead86a287255a428997c399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7572ecc467c061ef71cf4486ec63ec3e.png)
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【推荐2】已知:如图,AD⊥CD,BC⊥CD,D、C分别为垂足,AB的垂直平分线EF交AB于点E,交CD于点F,BC=DF.求证:
(1)∠DAF=∠CFB;
(2)EF=
AB.
(1)∠DAF=∠CFB;
(2)EF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/fca17e87-5c73-425a-9f6e-cb06383c1291.png?resizew=171)
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【推荐3】在平面直角坐标系xOy中,将一块含30°角的直角三角板按如图①所示的方式放置,直角顶点与原点重合,若点A的坐标为
,∠ABO=30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/7bf90d36-069f-4f1b-a68e-4a6f193eaa50.png?resizew=455)
(1)求AB 的长和BO的长;
(2)将图①所示的直角三角板绕点O顺时针旋转90°得到图②,在AB边的上方以AB为边作等边△ABC.问:是否存在这样的点D,使得以点A、B、C、D为顶点的四边形为菱形?若存在,请直接写出点D的所有可能的坐标;若不存在,请说明理由;
(3)在图②的基础上,过点O作OP⊥AB于点P得到图③.若点F是边OB的中点,点M是射线PF上的一个动点,当△OMB为直角三角形时,求OM的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/13/7bf90d36-069f-4f1b-a68e-4a6f193eaa50.png?resizew=455)
(1)求AB 的长和BO的长;
(2)将图①所示的直角三角板绕点O顺时针旋转90°得到图②,在AB边的上方以AB为边作等边△ABC.问:是否存在这样的点D,使得以点A、B、C、D为顶点的四边形为菱形?若存在,请直接写出点D的所有可能的坐标;若不存在,请说明理由;
(3)在图②的基础上,过点O作OP⊥AB于点P得到图③.若点F是边OB的中点,点M是射线PF上的一个动点,当△OMB为直角三角形时,求OM的长.
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