如图,在四边形
中,连接
.
(1)尺规作图:作
的垂直平分线
,分别交
于点
(不写作法,保留作图痕迹)
(2)连接
,若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/12/7e1c60e7-c5f7-4340-837f-ce54f748a9fa.png?resizew=126)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac31b9badf70a20d3b7d15f72da16d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e8589b90b9f931af7dc863af83fb71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
更新时间:2023-11-03 11:29:14
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
.
(1)设
、
的平分线交于点
,求
的度数;
(2)设
的外角
、
的平分线交于点
,求
的度数;
(3)
与
有怎样的数量关系?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
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【推荐2】已知菱形ABCD,E,F分别为菱形外的两点,且E,C,F三点共线,EF交AB于G,连接AE,DE,DF,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c82b4d5b73a308d7c1e7e639c385d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5342cbe4cef7e53de601640cd3cbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953714910707712/2956612209172480/STEM/ee56386b-f97e-4def-93c2-714e69c26020.png?resizew=165)
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【推荐3】请阅读下列材料,并完成相应任务.
在数学探究课上,老师出了这样一个题:如图
,锐角
内部有一点
,在其两边
和
上各取任意一点
,
,连接
,
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/acfb3eaa-c3e7-4bc0-a607-baa65f93aaea.png?resizew=420)
任务:
(1)小丽证明过程中的“依据”是指数学定理:______;
(2)下列说法正确的是______.
A.小丽的证法用严谨的推理证明了本题结论
B.小丽的证法还需要改变
的大小,再进行证明,本题的证明才完整
C.小红的证法用特殊到一般的方法证明了本题结论
D.小红的证法只要将点
在
的内部任意移动
次,重新测量进行验证,就能证明本题结论
(3)如图
,若点
在锐角
外部,
与
相交于点
,其余条件不变,原题中结论还成立吗?若成立,请说明理由;若不成立,请写出
,
,
,
之间的关系并证明.
在数学探究课上,老师出了这样一个题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f40b05cf192ef5f41a413e1f785a73f.png)
小丽的证法 | 小红的证法 |
证明: 如图 ![]() ![]() ![]() ![]() ![]() 又∵ ![]() ![]() ∴ ![]() | 证明: ∵ ![]() ![]() ![]() ![]() ∴ ![]() ∴ ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/acfb3eaa-c3e7-4bc0-a607-baa65f93aaea.png?resizew=420)
任务:
(1)小丽证明过程中的“依据”是指数学定理:______;
(2)下列说法正确的是______.
A.小丽的证法用严谨的推理证明了本题结论
B.小丽的证法还需要改变
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
C.小红的证法用特殊到一般的方法证明了本题结论
D.小红的证法只要将点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e35cfb01d9e4729e9b41eb33feb5b8c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
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名校
【推荐1】直线
交y轴于点A,交x轴于点B,以
为边在第一象限内作正方形
,
(1)求顶点C、D的坐标;
(2)点P在x轴上,且
的面积是正方形
面积的一半,求点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9427de5d22d37859a110dbb234313c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求顶点C、D的坐标;
(2)点P在x轴上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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【推荐2】已知:如图,在
中,
,
,
的垂直平分线分别交
和
于点
和点
,点
在
的延长线上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/fd280116-1753-4e49-a19b-1fd15af77f71.png?resizew=167)
(1)
的度数为______
;
(2)求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/2/fd280116-1753-4e49-a19b-1fd15af77f71.png?resizew=167)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
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解答题-作图题
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名校
【推荐1】如图,在△ABC中,∠ACB=90°,AC=BC=AD.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618709127151616/2624584923365376/STEM/445a1dc4-55da-4b40-8fa3-c881be728fde.png?resizew=183)
(1)作△ACD的高AE,点E为垂足(要求:尺规作图,不写作法,保留作图痕迹);
(2)在射线CD上找一点P,使△PCB与(1)中所作的△ACE全等(要求:尺规作图,不写作法,保留作图痕迹).并证明你所作出的△PCB与△ACE全等.
![](https://img.xkw.com/dksih/QBM/2020/12/21/2618709127151616/2624584923365376/STEM/445a1dc4-55da-4b40-8fa3-c881be728fde.png?resizew=183)
(1)作△ACD的高AE,点E为垂足(要求:尺规作图,不写作法,保留作图痕迹);
(2)在射线CD上找一点P,使△PCB与(1)中所作的△ACE全等(要求:尺规作图,不写作法,保留作图痕迹).并证明你所作出的△PCB与△ACE全等.
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解答题-作图题
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名校
【推荐2】下面是小明同学设计的“过直线外一点作已知直线的平行线”的尺规作图过程.
已知:如图1,直线l和直线l外一点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/f8a9d386-e136-4556-8483-96e471dfb1be.png?resizew=392)
求作:直线PQ,使直线PQ∥直线l.
作法:如图2,
①在直线l上取一点A,连接PA;
②作PA的垂直平分线MN,分别交直线l,线段PA于点B,O;
③以O为圆心,OB长为半径作弧,交直线MN于另一点Q;
④作直线PQ,所以直线PQ为所求作的直线.
根据上述作图过程,回答问题:
(1)用直尺和圆规,补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线MN是PA的垂直平分线,
∴
,
∵
,∠POQ=∠AOB
∴
.
∴
.
∴PQ∥l( )(填推理的依据).
已知:如图1,直线l和直线l外一点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/f8a9d386-e136-4556-8483-96e471dfb1be.png?resizew=392)
求作:直线PQ,使直线PQ∥直线l.
作法:如图2,
①在直线l上取一点A,连接PA;
②作PA的垂直平分线MN,分别交直线l,线段PA于点B,O;
③以O为圆心,OB长为半径作弧,交直线MN于另一点Q;
④作直线PQ,所以直线PQ为所求作的直线.
根据上述作图过程,回答问题:
(1)用直尺和圆规,补全图2中的图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线MN是PA的垂直平分线,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aede723eb91c0c402062acdd1891e87f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fcc302f3574f3dc3b2edb534567580.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156466281d1713c6f4f561dd372465f0.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e78c388afc565415fedcc951651e3a.png)
∴PQ∥l( )(填推理的依据).
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解答题-问答题
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适中
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解题方法
【推荐1】如图,在
中,
是
边上一点,且
,连接
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/2318863a-a3d8-4f21-bb54-9812765fe118.png?resizew=194)
(1)若
,求
的度数.
(2)若
,则
平分
是否成立?判断并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec1e8c8d9a6dae5c4b4c2da53de76e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438b26957e0cace29ccb5c2c197a5e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/2318863a-a3d8-4f21-bb54-9812765fe118.png?resizew=194)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3393b3590c1b09bca24ee67cfb592315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934a9508c176f44bf58f88715bd98f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3e081637bcea5368cc72370bae283b.png)
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【推荐2】如图,已知在
ABC中,∠A=∠ABC,直线EF分别交AB、AC和CB的延长线于点D、E、F.
(1)若∠A=65°,∠F=20°,求∠C、∠FEA的度数.
(2)∠F+∠FEC与∠A的关系是 .
A.∠F+∠FEC=∠A B.∠F+∠FEC=3∠A
C.∠F+∠FEC=2∠A D.∠F+∠FEC=4∠A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)若∠A=65°,∠F=20°,求∠C、∠FEA的度数.
(2)∠F+∠FEC与∠A的关系是 .
A.∠F+∠FEC=∠A B.∠F+∠FEC=3∠A
C.∠F+∠FEC=2∠A D.∠F+∠FEC=4∠A
![](https://img.xkw.com/dksih/QBM/2020/7/29/2516094402412544/2517272719106048/STEM/e5444c997f67488fb015dea64a7289a0.png?resizew=198)
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