如图所示,在
中,
的平分线
交
于点
,
垂直平分
,垂足为点
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a2d14052455d15fb657ff292176dbdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://img.xkw.com/dksih/QBM/2022/9/18/3069025121116160/3082800272809984/STEM/b6b1e639232b4ec081132afbd4135d17.png?resizew=182)
更新时间:2022-10-07 22:36:07
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐2】如图,点C、D是半圆弧上的两个动点,在运动过程中保持∠COD=90°
(1)如图1,OE平分∠AOC,OF平分∠BOD,写出∠EOF的度数;
(2)如图2,已知∠AOC的度数为x,OE平分∠AOD,OF平分∠BOC,
①直接写出∠AOD的度数,∠BOC的度数;
②求出∠EOF的度数.
(1)如图1,OE平分∠AOC,OF平分∠BOD,写出∠EOF的度数;
(2)如图2,已知∠AOC的度数为x,OE平分∠AOD,OF平分∠BOC,
①直接写出∠AOD的度数,∠BOC的度数;
②求出∠EOF的度数.
![](https://img.xkw.com/dksih/QBM/2019/4/22/2187784901541888/2188630634110976/STEM/3babc10de98e43f2bb1afaaca74bb41b.png?resizew=372)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,已知:点P是
内一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/669fe1b3-9e3b-4302-b1ff-a9f032a12a18.png?resizew=122)
(1)求证:
;
(2)若
平分
,
平分
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/669fe1b3-9e3b-4302-b1ff-a9f032a12a18.png?resizew=122)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce46139e29e62b47c2c4b9f925569eae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
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适中
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【推荐2】将一副三角尺按如图1位置摆放,其中O、E、F在直线l上,点B恰好落在DE边上,∠1=∠D=30°,∠A=45°,∠AOB=∠DEF=90°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/06d26375-06c7-448f-bc28-c4248dd85a34.png?resizew=488)
(1)求∠ABE的度数;
(2)如图2,将图1中的
沿直线l向左平移,使得DE、DF分别交AB于点G、H,求证:∠DGH=∠DHG;
(3)图1中的
沿直线l平移过程中,是否存在
的值最大?若存在,请在备用图中画出
,并说明点F的位置;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/06d26375-06c7-448f-bc28-c4248dd85a34.png?resizew=488)
(1)求∠ABE的度数;
(2)如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(3)图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dedf0fabaa6eae324a6280b68b15215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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解答题-作图题
|
适中
(0.65)
【推荐1】如图所示,直线
与坐标轴交于
、
两点,在
轴上取点
使得
,过点
作
交直线
于点
,反比例函数
与直线
交于点
,已知
.
(1)求反比例函数的解析式;
(2)用无刻度直尺和圆规作线段
的垂直平分线(不写作法,保留作图痕迹);
(3)判断点
是否在垂直平分线上,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7090adf670566a2d7ce5903924d72f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb0cb135b77b10612f470c5035dabd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93278327416d0474606954788bdd2f72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d49d34012ddf68fb981eb4975ac99b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3971055dc0d3b227472e95d726f9b45b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/26/828bd6eb-416f-44c1-a8fd-e54e2ec5b518.png?resizew=199)
(1)求反比例函数的解析式;
(2)用无刻度直尺和圆规作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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解答题-证明题
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名校
【推荐2】如图,
的对角线
相交于点O,
过点O且与
分别相交于点E,F,连接
.
;
(2)若
,
的周长是10,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c0dd1fab3ddac335bddbe89f0d6e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a13e1565e5977304abe033ea80742f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17fe30d57340c823f3aaa8734fc38d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐3】在《阿基米德全集》中的《引理集》中记录了古希腊数学家阿基米德提出的有关圆的一个引理.如图,已知
,C是弦
上一点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/33175c0e-13a4-477e-b699-763fe7ae7530.png?resizew=175)
(1)尺规作图(保留作图痕迹,不写作法);
①作线段
的垂直平分线
,分别交
于点D,垂足为E;
②以点D为圆心,
长为半径作弧,交
于点F(F,A两点不重合),连接
.
(2)引理的结论为:
.
证明:连接
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
∵
为
的垂直平分线
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed1b0a312e0ddf54abbbade60f2ca21.png)
又∵四边形
为圆的内接四边形
∴
___________
···①
又∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17e725f7683a9e4aa36da4af5355fbd.png)
∴∠___________=∠___________···②
又∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fea80035c9751c04dafc7210c108e8a.png)
∴___________=___________···③
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654f70e0727f5e539843e604782b0460.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed939716cd2fb2bc3cb6778ff1ef0bf6.png)
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/33175c0e-13a4-477e-b699-763fe7ae7530.png?resizew=175)
(1)尺规作图(保留作图痕迹,不写作法);
①作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
②以点D为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)引理的结论为:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3daf661e72bddd36989339e7ebccf4c.png)
证明:连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236c134aad7d9a21c49c07e924b9a531.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ed1b0a312e0ddf54abbbade60f2ca21.png)
又∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85719346f464a101d365d42be27450a3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3194038ee0420f2d33cd9b436a2137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e519cdb0cac3981d8e9610dba507a3.png)
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17e725f7683a9e4aa36da4af5355fbd.png)
∴∠___________=∠___________···②
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fea80035c9751c04dafc7210c108e8a.png)
∴___________=___________···③
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/654f70e0727f5e539843e604782b0460.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed939716cd2fb2bc3cb6778ff1ef0bf6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3daf661e72bddd36989339e7ebccf4c.png)
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解答题-证明题
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【推荐1】如图,AD与BC交于点O,
,以点O为圆心的⊙O经过点A、B、E,点E恰好在CD上,连接OE,OE平分
.证明:直线CD是⊙O的切线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed66570f697459aba9daa2eaf9460bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/1109df41-5405-4431-a1ed-dddcd0bd27e8.png?resizew=155)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知在
中,
的垂直平分线
交
于点
,连接
.
若
,求
的度数;
若
求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bed1b015150b0e23bf89383508fe129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dafe0912263fb91a8cec98f77b58a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b759cd9a7d584ef488199db4ed54d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2020/11/23/2599128139546624/2603942475472896/STEM/33d77638-df31-46fd-be46-6630c9dfddd3.png)
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