在等腰
和等腰
中,
,
,将
绕点
逆时针旋转,连接
,点
为线段
的中点,连接
.
旋转到
边上时,请直接写出线段
与
的位置关系和数量关系;
(2)如图2,当点
旋转到
边上时,(1)中的结论是否成立?若成立,请写出证明过程,若不成立,请说明理由.
(3)若
,在
绕点
逆时针旋转的过程中,当
时,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5713dd389cedc7caf41a9664ba07e194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88cfb3c704a4d382d05c5cc5bda9dc1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e106d4caf9d504dd934821479871ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4becf8d288d3ed206fd3c89c1e38ff04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d846d488fdef957b911bb295935852f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
2020·辽宁·中考真题 查看更多[8]
辽宁省铁岭、葫芦岛市2020年中考数学试题河南省洛阳市涧西区洛阳市东升第二中学2020-2021学年九年级上学期10月月考数学试题(已下线)重难点03 探究动态几何问题-2021年中考数学【热点·重点·难点】专练(已下线)(四川成都卷)2021年中考数学第三次模拟考试河北省石家庄市第四十中学2021-2022学年九年级下学期数学结课考试检测试题2023年江苏省徐州市中考数学模拟预测题2023年辽宁省本溪市第十二中学中考考前数学模拟预测题2023年辽宁省本溪第十二中学中考数学押题模拟预测题
更新时间:2020-08-17 19:29:55
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解答题-作图题
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【推荐1】已知:
ABC和
ADE是两个不全等的等腰直角三角形,其中BA=BC,DA=DE,连接EC,取EC的中点M,连接BM和DM.
(1)如图1,如果点D、E分别在边AC、AB上,那么BM、DM的数量关系与位置关系是 .
(2)将图1中的
ADE绕点A顺时针旋转90度,补全旋转后的图形,井判断(1)中的结论是否仍然成立,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图1,如果点D、E分别在边AC、AB上,那么BM、DM的数量关系与位置关系是 .
(2)将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/11/11/2848755949625344/2852382292713472/STEM/98123657-d98e-4a3b-ab0d-9b8969ff32d5.png)
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【推荐2】探究:如图1和图2,四边形ABCD中,已知AB=AD,∠BAD=90°,点E、F分别在BC、CD上,∠EAF=45°.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/6cd1c9e6-611a-488c-996c-55b532166aee.png?resizew=501)
(1)①如图1,若∠B、∠ADC都是直角,把△ABE绕点A逆时针旋转90°至△ADG,使AB与AD重合,直接写出线段BE、DF和EF之间的数量关系;
②如图2,若∠B、∠D都不是直角,则当∠B与∠D满足 关系时,线段BE、DF和EF之间依然有①中的结论存在,请你写出该结论的证明过程;
(2)拓展:如图3,在△ABC中,∠BAC=90°,AB=AC=2
,点D、E均在边BC上,且∠DAE=45°,若BD=1,求DE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/10/6cd1c9e6-611a-488c-996c-55b532166aee.png?resizew=501)
(1)①如图1,若∠B、∠ADC都是直角,把△ABE绕点A逆时针旋转90°至△ADG,使AB与AD重合,直接写出线段BE、DF和EF之间的数量关系;
②如图2,若∠B、∠D都不是直角,则当∠B与∠D满足 关系时,线段BE、DF和EF之间依然有①中的结论存在,请你写出该结论的证明过程;
(2)拓展:如图3,在△ABC中,∠BAC=90°,AB=AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐1】如图,在
中,
,
,
.点P从点A出发,以每秒4个单位长度的速度向终点B匀速运动,点Q为线段
的中点.点D与点C在
的同侧,且
.设点P的运动时间为t(秒).
(1)线段
的长为 (用含t的代数式表示);
(2)当点D落在
边上时,求
的长;
(3)当
与
重叠部分是轴对称图形时,求t的值;
(4)当点D到
任意两边距离相等时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e727850281a1cb6b655ecd17098b9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee81a5a4de7ea803b31b7ebf9ff1b9e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/4da19a39-fb59-4d6a-ad3d-7f7bb6c330cc.png?resizew=130)
(1)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当点D落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(4)当点D到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
【推荐2】(1)把两个全等的矩形
和矩形
拼成如图1的图案,则
= ;
(2)如图2,在正方形
中,点E使
边上一点(不与点C、D重合),连接
,将
绕点E顺时针旋转
至
,作射线
交
的延长线于点G,求证:
;
(3)在菱形
中,
,点E使
边上一点(不与点C、D重合),连接
,将
绕点E顺时针旋转
至
,作射线
交
的延长线于点G,
①线段
与
的数量关系是
②若
,E是
的三等分点,则
的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/752fa646a2d9cfca34001748445301c9.png)
(2)如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c49a8ba3024d05511eed8c96d3a68f3.png)
(3)在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f3197779e26c71a1b633b279613969.png)
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【推荐1】在平面直角坐标系中,四边形
为矩形,
,
,点E从B点出发沿
运动,点F从B点出发沿
运动,点G从O点出发沿
运动.
沿
折叠,点A恰好落在点E处,求E,F两点的坐标;
(2)如图2,若E,F两点以相同的速度同时出发运动,使
,设点E的横坐标为m,求
的值;
(3)如图3,已知点
,若F,G两点以相同的速度同时出发运动,连接
,作
于H,直接写出
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e3c307115cf97351ad51ff9edcff5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8985f59af286583f81353c50e720af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d01b9de38c02e28c475bf639727b59e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(2)如图2,若E,F两点以相同的速度同时出发运动,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee480d748f36c1b43e941384dd41f13e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b49c77a142b1f5ed4b92c1217659df.png)
(3)如图3,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e725fb39dccaae5c25d8e80ecad40326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a15e93e6e98fcf10eca6736ab89ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
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【推荐2】(1)【探究发现】如图①,等腰△ACB,∠ACB =90°,D为 AB 的中点,∠MDN=90°,将∠MDN绕点D旋转,旋转过程中,∠MDN的两边分别与线段 AC、线段 BC交于点 E、F(点 F与点 B、C不重合),写出线段 CF、CE、BC 之间的数量关系,并证明你的结论;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/415be32f-421b-412e-8abe-d23404a13e25.png?resizew=191)
(2)【类比应用】如图②,等腰△ACB,∠ACB=120°,D 为 AB 的中点,∠MDN=60°,将∠MDN 绕点 D 旋转,旋转过程中,∠MDN 的两边分别与线段 AC、线段 BC 交于点 E、F(点 F 与点 B、C 不重合),直接写出线段 CF、CE、 BC 之间的数量关系为______;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/ddd2f3ea-c857-4915-9c5f-8745d7f4a70c.png?resizew=199)
(3)【拓展延伸】如图③,在四边形 ABCD 中,AC 平分∠BCD,∠BCD=120°,DAB=60°,过点 A 作 AE⊥AC, 交 CB 的延长线于点 E,若 CB=6,DC=2,则 BE 的长为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/415be32f-421b-412e-8abe-d23404a13e25.png?resizew=191)
(2)【类比应用】如图②,等腰△ACB,∠ACB=120°,D 为 AB 的中点,∠MDN=60°,将∠MDN 绕点 D 旋转,旋转过程中,∠MDN 的两边分别与线段 AC、线段 BC 交于点 E、F(点 F 与点 B、C 不重合),直接写出线段 CF、CE、 BC 之间的数量关系为______;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/ddd2f3ea-c857-4915-9c5f-8745d7f4a70c.png?resizew=199)
(3)【拓展延伸】如图③,在四边形 ABCD 中,AC 平分∠BCD,∠BCD=120°,DAB=60°,过点 A 作 AE⊥AC, 交 CB 的延长线于点 E,若 CB=6,DC=2,则 BE 的长为 .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/94a72829-c274-4150-8615-a35d7053f71a.png?resizew=117)
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【推荐1】已知平面直角坐标系xOy中,抛物线L:y=ax2﹣2ax+a(a>0)与y轴相交于A点,过点A作x轴的平行线与抛物线L的另一交点为B点.直线y=kx﹣k(k>a)与抛物线L相交于C,D两点(点C在点D的左侧),与y轴交于E点,过点D作DH⊥AB,垂足为H,连接EH交x轴于G点.
(1)若a=1,k=2,求DH的长;
(2)当a
时,求cos∠AHE的值;
(3)连接BC,求证:四边形BCGH是平行四边形.
(1)若a=1,k=2,求DH的长;
(2)当a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514236164053e00a44b3e9b462ef687d.png)
(3)连接BC,求证:四边形BCGH是平行四边形.
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【推荐2】如图,已知点P为
外一点,点A为
上一点,直线
与
的另一个交点为点B,
是
的直径,
的平分线
交
于点D,连接
并延长交直线
于点M,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/8f3bf61d-6cc1-4a97-b97c-2d81dd7c8131.png?resizew=115)
(1)求证:
;
(2)若
,
的直径为4,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32986401a4d24904d5e446fa9210ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/8f3bf61d-6cc1-4a97-b97c-2d81dd7c8131.png?resizew=115)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954d23850ead90dd495168b3f251b065.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fe89d7f8828f6d76dbfd167bb881e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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