如图,在四边形中,
,
,
,E,F分别是
的中点.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5d5f49c0d6162ea6264c23fdff924cf.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
更新时间:2023-10-19 09:11:46
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解答题-证明题
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【推荐1】如图,AB是⊙O的直径,AC是⊙O的切线,切点为A,BC交⊙O于点D,点E是AC的中点.
(1)求证:直线DE是⊙O的切线;
(2)若⊙O半径为1,BC=4,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/8eb8a373-e433-40e6-a9e7-abec6b9720f2.png?resizew=195)
(1)求证:直线DE是⊙O的切线;
(2)若⊙O半径为1,BC=4,求图中阴影部分的面积.
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【推荐2】如图,在正方形
中,点E,F分别在边
,
上,且
,
与
相交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9c693bbc-ed16-4c2d-8473-32f3f6bd87dc.png?resizew=156)
(1)求证:
;
(2)求证:
;
(3)若
,
,求线段
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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/9c693bbc-ed16-4c2d-8473-32f3f6bd87dc.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9327d1c2faee1d33db246ab52e43e4f9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
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解答题-问答题
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(0.65)
【推荐1】如图,在△ABC中,AD平分∠BAC,点E为AC中点,AD与BE相交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/fcbb3f9d-2a79-49fa-9a6b-c0b61798970c.png?resizew=196)
(1)若∠ABC=40°,∠C=80°,求∠ADB的度数;
(2)过点B作BH⊥AD交AD延长线于点H,作△ABH关于AH对称的△AGH,设△BFH,△AEF的面积分别为S1,S2,若S△BCG=4,试求S1﹣S2的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/fcbb3f9d-2a79-49fa-9a6b-c0b61798970c.png?resizew=196)
(1)若∠ABC=40°,∠C=80°,求∠ADB的度数;
(2)过点B作BH⊥AD交AD延长线于点H,作△ABH关于AH对称的△AGH,设△BFH,△AEF的面积分别为S1,S2,若S△BCG=4,试求S1﹣S2的值.
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适中
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【推荐2】如图,点
为等边三角形
中
边上一点,连接
,以
为边在
的左侧作等边三角形
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)
的度数;
(2)线段
之间的数量关系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/04aace61-2165-46fb-b18a-96b3a5648e47.png?resizew=153)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff705439ea5ea64c0c0834cb042d3091.png)
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【推荐1】如图,
ABC中,∠BAC=90°,点D是边BC的中点,将
ABD沿AD翻折得到
AED,连CE.
(1)求证:CE
AD;
(2)连接BE,判断
CEB的形状,并说明理由;
(3)若∠ABC=50°,AC、ED交于点F,求∠DFC的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求证:CE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
(2)连接BE,判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)若∠ABC=50°,AC、ED交于点F,求∠DFC的度数.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828466024587264/2829716188413952/STEM/6b70e907-362f-49c9-9d20-126b4803bd67.png)
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解答题-证明题
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(0.65)
【推荐2】如图,在
中,
,F是
的中点,
,垂足为点E,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/69516868-3da8-40a7-92af-621fa00b21e7.png?resizew=196)
(1)求证:
平分
;
(2)若
,
,求
的面积;
(3)请判断线段
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42b730d87bb95763a48c69f1b0329ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/69516868-3da8-40a7-92af-621fa00b21e7.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df18b374eb6f9f1cd9473dfe7a84ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e5a933a2a0ff3a28009cc989293ff5.png)
(3)请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐1】如图,在
中,AB=AC,AD平分∠BAC交BC于点D,在线段AD上任取一点P(点A除外),过点P作EF∥AB.分别交AC、BC于点E和点F,作PQ∥AC,交AB于点Q,连接QE.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/b3e7c15e-3a41-4366-89fb-05284e1f7694.png?resizew=169)
(1)求证:四边形AEPQ为菱形:
(2)当点P在线段EF上的什么位置时,菱形AEPQ的面积为四边形EFBQ面积的一半?请说明理
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/b3e7c15e-3a41-4366-89fb-05284e1f7694.png?resizew=169)
(1)求证:四边形AEPQ为菱形:
(2)当点P在线段EF上的什么位置时,菱形AEPQ的面积为四边形EFBQ面积的一半?请说明理
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名校
【推荐2】如图,在四边形
中,
,对角线
交于点
平分
,过点
作
交
的延长线于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/93fccfe8-62b7-4568-926d-e270b7d09d09.png?resizew=175)
(1)求证:
;
(2)求证:四边形
是菱形;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd64b7e072d60e2aa1fea771b65406b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875b90470f7c0e85c988b0cc12aca03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/93fccfe8-62b7-4568-926d-e270b7d09d09.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed1b0a312e0ddf54abbbade60f2ca21.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b11ca0cc9a775ae01fcf593cb0d3283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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