如图(1)正方形ABCD和正方形AEFG,边AE在边AB上,AB=12,AE=6
.将正方形AEFG绕点A逆时针旋转α(0°≤α≤45°)
(1)如图(2)正方形AEFG旋转到此位置,求证:BE=DG;
(2)在旋转的过程中,当∠BEA=120°时,试求BE的长;
(3)BE的延长线交直线DG于点Q,当正方形AEFG由图(1)绕点A逆时针旋转45°,请直接写出旋转过程中点Q运动的路线长;
(4)在旋转的过程中,是否存在某时刻BF=BC?若存在,试求出DQ的长;若不存在,请说明理由.(点Q即(3)中的点)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)如图(2)正方形AEFG旋转到此位置,求证:BE=DG;
(2)在旋转的过程中,当∠BEA=120°时,试求BE的长;
(3)BE的延长线交直线DG于点Q,当正方形AEFG由图(1)绕点A逆时针旋转45°,请直接写出旋转过程中点Q运动的路线长;
(4)在旋转的过程中,是否存在某时刻BF=BC?若存在,试求出DQ的长;若不存在,请说明理由.(点Q即(3)中的点)
![](https://img.xkw.com/dksih/QBM/2019/5/22/2209076762820608/2209729547132928/STEM/114b25029871465381d02e66140e9f4b.png?resizew=443)
更新时间:2019-05-23 10:09:11
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相似题推荐
【推荐1】在如图1所示的平面直角坐标系中,O为原点, ⊙C的圆心坐标为(−2,−2),半径为
,直线y=−x+2与x轴,y轴分别交于点A,B,点P在线段AB上运动(包括端点).
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(1)直线CO与AB的夹角是_________
;
(2)当
是等腰三角形时,求点P的坐标;
(3)当直线
与
相切时,求
的度数;
(4)如图2.直线
与
相交于点E,F,M为线段
的中点,当点P在线段
上运动时,点M也相应运动,请直接写出点M所经过路径的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/2022/3/22/2941579246657536/2948542759297024/STEM/0d28949a-22bf-4d4e-a1a8-be07514e131b.png?resizew=426)
(1)直线CO与AB的夹角是_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e534b545e86c02abd2a0dc75d32b407.png)
(3)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
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(4)如图2.直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,正方形ABCD的边长为4cm,点E、F分别从点D和点C出发,沿着射线DA、射线CD运动,且DE=CF,直线AF、直线BE交于H点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/14954676-8212-47a4-9b40-b8b2ae4f7028.png?resizew=165)
(1)当点E从点D向点A运动的过程中:
①求证:AF⊥BE;
②在图中画出点H运动路径并求出点H运动的路径长;
(2)在整个运动过程中:
①线段DH长度的最小值为______.
②线段DH长度的最大值为_________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/20/14954676-8212-47a4-9b40-b8b2ae4f7028.png?resizew=165)
(1)当点E从点D向点A运动的过程中:
①求证:AF⊥BE;
②在图中画出点H运动路径并求出点H运动的路径长;
(2)在整个运动过程中:
①线段DH长度的最小值为______.
②线段DH长度的最大值为_________ .
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【推荐1】如图,矩形OABC在平面直角坐标系中,O为坐标原点,点A(0,4),C(2,0),将矩形OABC绕点O按顺时针方向旋转1800,得到矩形OEFG,顺次连接AC、CE、EG、GA.
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(1)请直接写出点F的坐标;
(2)试判断四边形ACEG的形状,并说明理由;
(3)将矩形OABC沿y轴向下平移m个单位(0<m<4),设平移过程中矩形与
重叠部分面积为
,当
:
=11:16时,求m的值.
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(1)请直接写出点F的坐标;
(2)试判断四边形ACEG的形状,并说明理由;
(3)将矩形OABC沿y轴向下平移m个单位(0<m<4),设平移过程中矩形与
![](https://img.xkw.com/dksih/QBM/2014/2/26/1573709538951168/1573709544521728/STEM/04ae8f617d7f41f183051a59b8b6663f.png)
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【推荐2】综合与实践
某学校的数学兴趣小组发现这样一个模型,两个顶角相等的等腰三角形,如果具有公共的顶角的顶点,并把它们的底角顶点连接起来,会形成一组全等的三角形,具有这个规律的图形称为“手拉手”图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/0a274125-a246-4b0e-a8ec-313e15b6b6d6.png?resizew=503)
(1)[材料理解]如图1,在
中,分别以
,
为边向外作等腰
和等腰
.
,
,
,连接
,
,试猜想
与
的大小关系,并说明理由;
(2)[深入探究]如图2,在
中,
,
,
,分别以
,
为边向外作等腰直角
和等腰直角
,
,连接
,
,求
的长.
(3)[延伸应用]如图3,在
中,
,点D为平面内一点,连接
,
,满足
,
,
,
,求
的长.
某学校的数学兴趣小组发现这样一个模型,两个顶角相等的等腰三角形,如果具有公共的顶角的顶点,并把它们的底角顶点连接起来,会形成一组全等的三角形,具有这个规律的图形称为“手拉手”图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/6/0a274125-a246-4b0e-a8ec-313e15b6b6d6.png?resizew=503)
(1)[材料理解]如图1,在
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![](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/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e2073e0623440ec5ced1556b0bcd0b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cc2450dc300ce26b513c2abae28cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)[深入探究]如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb526b48aa04eeaba6329ec1c54150a1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22aeea9de135b03dab90e7879f7b3016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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(3)[延伸应用]如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64886482f1736b1fb90406af1a6871c9.png)
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【推荐3】(1)观察理解:如图1,
中,
,
,直线过点
,点
在直线同侧,
,
,垂足分别为
,由此可得:
,所以
,又因为
,所以
,所以
,又因为
,所以
(______);(请填写全等判定的方法);
(2)理解应用:如图2,
,且
,
,且
,利用(1)中的结论,请按照图中所标注的数据计算图中实线所围成的图形的面积
_____;
(3)类比探究:如图3,
中,
,
,将斜边
绕点
逆时针旋转
至
,连接
,求
的面积;
(4)拓展提升:如图4,等边
中,
cm,点
在
上,且
cm,动点
从点
沿射线
以2cm/s速度运动,连接
,将线段
绕点
逆时针旋转
得到线段
,设点
运动的时间为
秒.
当
_____秒时,
;
当
_____秒时,点
恰好落在射线
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/ea2ab1d3-2367-4c40-9f11-59314d2a77b6.png?resizew=501)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e77a906a317863df81327e97ae0d5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f0ca8685431a5114a4b9288e6f93bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2b6f11b74b1cb04d9ed8fe485687e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfc52a6655c83c8c7eb081bd0f26e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e72d812fdaca589976ea299cc7468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c129fbab6979fd83f4c1ef52feb35557.png)
(2)理解应用:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
(3)类比探究:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f6bf45ecba77a2581e1142bd16bf8a.png)
(4)拓展提升:如图4,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6818a98204f62c1b16699d26ca0c3f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322ede371576df906bb29e63ccd8ca6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b561e63043cd4c4e2e295d817e83ac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/ea2ab1d3-2367-4c40-9f11-59314d2a77b6.png?resizew=501)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/06cae24f-7565-40e8-b988-d30e6f190183.png?resizew=390)
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名校
【推荐1】在平面直角坐标系中,已知抛物线y=ax2+4ax+4a﹣6(a>0)与x轴交于A,B两点(点A在点B的左侧),与y轴交于点C,顶点为点D.
(1)当a=6时,直接写出点A,B,C,D的坐标:
A ,B ,C ,D ;
(2)如图1,直线DC交x轴于点E,若tan∠AED=
,求a的值和CE的长;
(3)如图2,在(2)的条件下,若点N为OC的中点,动点P在第三象限的抛物线上,过点P作x轴的垂线,垂足为Q,交AN于点F;过点F作FH⊥DE,垂足为H.设点P的横坐标为t,记f=FP+FH.
①用含t的代数式表示f;
②设﹣5<t≤m(m<0),求f的最大值.
(1)当a=6时,直接写出点A,B,C,D的坐标:
A ,B ,C ,D ;
(2)如图1,直线DC交x轴于点E,若tan∠AED=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
(3)如图2,在(2)的条件下,若点N为OC的中点,动点P在第三象限的抛物线上,过点P作x轴的垂线,垂足为Q,交AN于点F;过点F作FH⊥DE,垂足为H.设点P的横坐标为t,记f=FP+FH.
①用含t的代数式表示f;
②设﹣5<t≤m(m<0),求f的最大值.
![](https://img.xkw.com/dksih/QBM/2021/4/28/2709379858153472/2709606769164288/STEM/fc214b56c6dc4552b7308207bc36f3d0.png?resizew=394)
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解答题-问答题
|
较难
(0.4)
【推荐2】已知:等边
中,
平分
,点
为
边上一点(不与点
、点
重合),且
,连接
,取
的中点
,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/5c493bff-6d67-4d79-8bcf-137447a9c5e8.png?resizew=332)
(1)当点
在
边上时,在图1中画出
,直接写出
与
的位置关系与数量关系;
(2)如图2,当点
不在
边上时,图1中的结论还成立吗?若成立,请证明;若不成立,请说明理由;
(3)在(2)的条件下,点
在
上,若
,连接
,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3620030e8808da46df97330103827913.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/5c493bff-6d67-4d79-8bcf-137447a9c5e8.png?resizew=332)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4bce2463e8caf5f233ca0fab34264f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db6b8019ae3faca0b6e14cc8a1504bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
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