如图,在
中,
,
,将
绕点
逆时针旋转一定的角度
(
)得到
,连接
、
交于点
,当
时,判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe72cd12b3faac777474e2b78ab19203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ecac2dad4cffdd971fd23deacff3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b1c18e9541d8162f9b4c63d3d2d6fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/13ff15e2-2849-42cf-bfd8-3f9f29095f63.png?resizew=106)
更新时间:2024-01-14 17:27:33
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在△ABC中,∠A=40°,点D,E分别在边AB,AC上,BD=BC=CE,连结CD,BE.
![](https://img.xkw.com/dksih/QBM/2022/3/17/2937936715268096/2962970870816768/STEM/15f62d2c-59af-48ba-b7ee-a6471de38635.png?resizew=188)
(1)若∠ABC=80°,求∠DCA的度数:
(2)若∠DCA=x°,求∠EBC的度数(用含x的代数式表示).
![](https://img.xkw.com/dksih/QBM/2022/3/17/2937936715268096/2962970870816768/STEM/15f62d2c-59af-48ba-b7ee-a6471de38635.png?resizew=188)
(1)若∠ABC=80°,求∠DCA的度数:
(2)若∠DCA=x°,求∠EBC的度数(用含x的代数式表示).
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【推荐2】如图1,AB、BC被直线AC所截,点D是线段AC上的点,过点D作DE
AB,连接AE,∠B=∠E=75°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/f6c83c3d-7ddc-4bf0-b266-90c5a58c71b0.png?resizew=315)
(1)求证:AE
BC;
(2)将线段AE沿着直线AC平移得到线段PQ,连接DQ.如图2,当DE⊥DQ时,求∠Q的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/f6c83c3d-7ddc-4bf0-b266-90c5a58c71b0.png?resizew=315)
(1)求证:AE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)将线段AE沿着直线AC平移得到线段PQ,连接DQ.如图2,当DE⊥DQ时,求∠Q的度数.
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解答题-证明题
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适中
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【推荐1】如图,
中,
,点D、E、F分别在边
、
、
上,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/329250cb-3e88-44b9-80f5-655e42e51113.png?resizew=97)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74451cb021d33293b020876f90e433f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07601cea58f3c4a194798a70716da86d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/6/329250cb-3e88-44b9-80f5-655e42e51113.png?resizew=97)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37e3e277945feebd04faf6acde7a55c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b788455345878749fdfb16f29f8764d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9bf590daee7021eec56f960a72892f.png)
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【推荐2】如图,在
中,
边的垂直平分线
交
于点
,
边的垂直半分线
交
于点
,
与
相交于点
,连接
,
,若
的周长为
,
的周长为
.
(1)求线段
的长;
(2)连接
,求线段
的长;
(3)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc52a06d806fde891e09a0a389fcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9822e15763be5cb6c49936df274a6748.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/962d7663-f741-4662-912c-ed597850d799.png?resizew=249)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b3ccbed8aa44da96fbf16bb9978b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】D是
的边AB上的一点,E是边BC边的中点,过点C作AB的平行线,交DE的延长线于点F,连接CD、BF.
![](https://img.xkw.com/dksih/QBM/2022/3/5/2929605799526400/2941189026947072/STEM/36769431-dfec-496e-b48f-39bb96e7605e.png?resizew=226)
(1)求证:DE=EF.
(2)已知BC=8,DF=6,当DB=___________时,四边形CDBF是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2022/3/5/2929605799526400/2941189026947072/STEM/36769431-dfec-496e-b48f-39bb96e7605e.png?resizew=226)
(1)求证:DE=EF.
(2)已知BC=8,DF=6,当DB=___________时,四边形CDBF是菱形.
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名校
【推荐2】已知
,
,
.
(1)如图1,
平分
,求证:四边形
是菱形;
(2)如图2,将(1)中的
绕点
逆时针旋转(旋转角小于
),
,
的延长线相交于点
,用等式表示
与
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d76e0315b1e11914db3dcf3b4e7f80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2da1d50433aecf541991fd0f01773cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/56e003f7-488f-4cbb-b8c6-93c3c3802007.png?resizew=266)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
(2)如图2,将(1)中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7652fd5598a9eaa011726784cae56bc8.png)
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【推荐1】综合与实践
操作判断
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/e8cf39f5-8908-436d-8f77-9ab2c1021626.png?resizew=460)
(1)操作一:将正方形
与正方形
的顶点
重合,点
在正方形
的边
上,如图1,连接
,取
的中点
,连接
.操作发现(提示:
交
于
点),
与
的位置关系是______;
与
的数量关系是______.
(2)操作二:将正方形
绕顶点
顺时针旋转,(1)中的两个结论是否仍然成立?如果成立,请仅就图2的情形进行证明;如果不成立,请说明理由.
操作判断
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/e8cf39f5-8908-436d-8f77-9ab2c1021626.png?resizew=460)
(1)操作一:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e78cda70440f0815e823af09082b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59faf75f0c95312e556ae905b3ff5b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
(2)操作二:将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图(1),已知∠DAC=90°,△ABC是等边三角形,点P为射线AD上任意一点(点P与点A不重合),连接CP,将线段CP绕点C顺时针旋转60°得到线段CQ,连接QB并延长交射线AD于点E,交线段CP于点F.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912470938648576/2923967635783680/STEM/e05e7d3d-022f-48c6-b3e5-1aa7e135af3c.png?resizew=441)
(1)如图(1),猜想∠QEP= °;
(2)如图(2),图(3),若当∠DAC是锐角或钝角时,其他条件不变,(1)中的猜想还成立吗?若成立,请选取其中一种情况加以证明;若不成立,请写出你的猜想并加以证明.
(3)如图(3),若∠DAC=135°,∠ACP=15°,且AC=4,求BQ的长.
![](https://img.xkw.com/dksih/QBM/2022/2/9/2912470938648576/2923967635783680/STEM/e05e7d3d-022f-48c6-b3e5-1aa7e135af3c.png?resizew=441)
(1)如图(1),猜想∠QEP= °;
(2)如图(2),图(3),若当∠DAC是锐角或钝角时,其他条件不变,(1)中的猜想还成立吗?若成立,请选取其中一种情况加以证明;若不成立,请写出你的猜想并加以证明.
(3)如图(3),若∠DAC=135°,∠ACP=15°,且AC=4,求BQ的长.
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