如图,在菱形
中,点
为
边上一点,请仅用无刻度直尺 分别按下列要求画图.(保留画图痕迹)
(1)在图1中,在
边画出一点
,使
;
(2)在图2中,以
为顶点画一个矩形,使得矩形的四个顶点都在菱形的边上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/a7faf1c0-4537-4baa-ac60-0e47471538a9.png?resizew=390)
(1)在图1中,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40b3bf6b27f936e0747de92151a1f77.png)
(2)在图2中,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
更新时间:2023-07-11 11:26:10
|
相似题推荐
【推荐1】某学校活动小组在作三角形的拓展图形,研究其性质时,经历了如下过程:
操作发现:
(1)如图1,分别以AB和AC为边向△ABC外侧作等边△ABD和等边△ACE,连接BE、CD,请你完成作图并证明BE=CD.(要求:尺规作图,不写作法但保留作图痕迹)
类比探究:
(2)如图2,分别以AB和AC为边向△ABC外侧作正方形ABDE和正方形ACFG,连接CE、BG,则线段CE、BG有什么关系?说明理由.
灵活运用:
(3)如图3,在四边形ABCD中,AC、BD是对角线,AB=BC,∠ABC=60°,∠ADC=30°,AD=3,BD=5,求CD的长.
操作发现:
(1)如图1,分别以AB和AC为边向△ABC外侧作等边△ABD和等边△ACE,连接BE、CD,请你完成作图并证明BE=CD.(要求:尺规作图,不写作法但保留作图痕迹)
类比探究:
(2)如图2,分别以AB和AC为边向△ABC外侧作正方形ABDE和正方形ACFG,连接CE、BG,则线段CE、BG有什么关系?说明理由.
灵活运用:
(3)如图3,在四边形ABCD中,AC、BD是对角线,AB=BC,∠ABC=60°,∠ADC=30°,AD=3,BD=5,求CD的长.
![](https://img.xkw.com/dksih/QBM/2020/11/7/2587906408701952/2588479297200128/STEM/318b5594c13847c7bdbd4ed9d604fdf2.png?resizew=430)
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【推荐2】如图①,点P是∠AOB的平分线OC上的一点,我们可以分别OA、OB在截取点M、N,使OM=ON,连结PM、PN,就可得到
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ad952372-2e6c-4ab9-a1b0-259ebf7b75d2.png?resizew=496)
(1)请你在图①中,根据题意,画出上面叙述的全等三角形
和
,并加以证明.
(2)请你参考(1)中的作全等三角形的方法,解答下列问题:
(Ⅰ)如图②,在△ABC中,∠ACB是直角,∠B=60°,AD、CE分别是∠BAC、∠BCA的平分线,AD、CE相交于点F.请你判断并写出FE与FD之间的数量关系.
(Ⅱ)如图③,在△ABC中,如果∠ACB不是直角,而(1)中的其它条件不变,请问,你在(Ⅰ)中所得结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/139500a4ec7e89d5c14b9ed087cfaff8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/1/ad952372-2e6c-4ab9-a1b0-259ebf7b75d2.png?resizew=496)
(1)请你在图①中,根据题意,画出上面叙述的全等三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1addaf4de4d91f3553f7d0e5579fa92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a04498a3ea087bdd04cd3d77b070b35.png)
(2)请你参考(1)中的作全等三角形的方法,解答下列问题:
(Ⅰ)如图②,在△ABC中,∠ACB是直角,∠B=60°,AD、CE分别是∠BAC、∠BCA的平分线,AD、CE相交于点F.请你判断并写出FE与FD之间的数量关系.
(Ⅱ)如图③,在△ABC中,如果∠ACB不是直角,而(1)中的其它条件不变,请问,你在(Ⅰ)中所得结论是否仍然成立?若成立,请证明;若不成立,请说明理由.
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【推荐1】如图,
,点
是线段
的一个三等分点,以点
为圆心,
为半径的圆交
于点
,交
于点
,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb19a9c8a3270021e6697ebad0d3063.png)
(1)求证:
是
的切线;
(2)点
为
上的一动点,连接
.
①当
时,四边形
是菱形;
②当
时,四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d03cd6f31cb6d245e6989439ce0c3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/9eb19a9c8a3270021e6697ebad0d3063.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/17/6da8f09a-99a5-495d-bfc2-d49e6655d322.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc86571bb1c65aefbc3126e7dcf484a.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b05714b8620eba2f56084a91442533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945e93c9f3515ded840de09a9ba81ce8.png)
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【推荐2】已知△ABC为等腰直角三角形,∠ACB=9
0°,点A在直线DE上,过C点作CF⊥DE于F,过B点作BG⊥DE于G.
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322411577769984/2326908026372096/STEM/f23654a7cc084c1ca3d22827b6701cba.png?resizew=480)
(1)发现问题:如图1,当B、C两点均在直线DE上方时,线段AG、BG和CF存在的数量关系是 .
(2)类比探究:当△ABC绕点A顺时针旋转至图2的位置时,线段AG、BG和CF之间的数量关系是否会发生变化?如果不变,请说明理由;如果变化,请写出你的猜想,并给予证明;
(3)拓展延伸:当△ABC绕点A顺时针旋转至图3的位置时,若CF=1,AG=2,请直接写出△ABC的面积.
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322411577769984/2326908026372096/STEM/58c5a03359ff4dc997a0cd0d6711d341.png?resizew=3)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322411577769984/2326908026372096/STEM/f23654a7cc084c1ca3d22827b6701cba.png?resizew=480)
(1)发现问题:如图1,当B、C两点均在直线DE上方时,线段AG、BG和CF存在的数量关系是 .
(2)类比探究:当△ABC绕点A顺时针旋转至图2的位置时,线段AG、BG和CF之间的数量关系是否会发生变化?如果不变,请说明理由;如果变化,请写出你的猜想,并给予证明;
(3)拓展延伸:当△ABC绕点A顺时针旋转至图3的位置时,若CF=1,AG=2,请直接写出△ABC的面积.
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真题
【推荐3】在平面直角坐标系xOy中,点P是抛物线:y=x2上的动点(点在第一象限内).连接 OP,过点0作OP的垂线交抛物线于另一点Q.连接PQ,交y轴于点M.作PA丄x轴于点A,QB丄x轴于点B.设点P的横坐标为m.
![](https://img.xkw.com/dksih/QBM/2012/7/19/1573458330214400/1573458364096512/STEM/612302082abd48e4b5b3d40b008cb78e.png)
(1)如图1,当m=
时,
①求线段OP的长和tan∠POM的值;
②在y轴上找一点C,使△OCQ是以OQ为腰的等腰三角形,求点C的坐标;
(2)如图2,连接AM、BM,分别与OP、OQ相交于点D、E.
①用含m的代数式表示点Q的坐标;
②求证:四边形ODME是矩形.
![](https://img.xkw.com/dksih/QBM/2012/7/19/1573458330214400/1573458364096512/STEM/612302082abd48e4b5b3d40b008cb78e.png)
(1)如图1,当m=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
①求线段OP的长和tan∠POM的值;
②在y轴上找一点C,使△OCQ是以OQ为腰的等腰三角形,求点C的坐标;
(2)如图2,连接AM、BM,分别与OP、OQ相交于点D、E.
①用含m的代数式表示点Q的坐标;
②求证:四边形ODME是矩形.
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【推荐1】若四边形对角线互相垂直,那么我们定义这种四边形为“对垂”四边形.
特征辨析
(1)下列4个图中,四边形
不是“对垂”四边形的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/b477e473-d05c-4ee6-bd02-98b8c583c9fa.png?resizew=509)
归纳探究
(2)如图1,
于O,动点P,Q都从O点出发,点P沿
运动到B,点Q沿
运动到C.
①当
,
,
,
时,则
___________,
___________,据此结合(1)中相关图形试猜想“对垂”四边形
两组对边
与
之间的数量关系:___________(用等式表示);
②在“对垂”四边形
中,当①中的条件都不存在时,①中所猜想的数量关系还成立吗?若成立,请予以证明;若不成立,请说明理由.
拓展应用
(3)如图2,四边形
和四边形
均为正方形,点B恰好在
的延长线上,且已知
,
,求
的长.
特征辨析
(1)下列4个图中,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/b477e473-d05c-4ee6-bd02-98b8c583c9fa.png?resizew=509)
归纳探究
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b68349d796cd6364397d2bd0ea2e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70834818750d0454474ac7c357cd287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e3dfcd8aff269dd5aba398816490c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cb6f1a931d1d6c9175f19d1b4584a6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8ed4d3eceeb61ccc2f7cf5fd7c3f81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b79c80cc81b5446dfac3ee97b03c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd38e0d42026b953b2fd2ad3634ecb4.png)
②在“对垂”四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
拓展应用
(3)如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1505d41fe799543518c642d87f6f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04171842cecdf6ca503faf888bba0106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/17c7173e-a0d4-4b63-8be3-3d0d0b4d5b6b.png?resizew=464)
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【推荐2】如图1,四边形ABCD是菱形,AD=10,过点D作AB的垂线DH,垂足为H,交对角线AC于M,连接BM,且AH=6.
(1)求证:DM=BM;
(2)求MH的长;
(3)如图2,动点P从点A出发,沿折线ABC方向以2个单位/秒的速度向终点C匀速运动,设△PMB的面积为S(S≠0),点P的运动时间为t秒,求S与t之间的函数关系式;
(4)在(3)的条件下,当点P在边AB上运动时是否存在这样的t值,使∠MPB与∠BCD互为余角,若存在,则求出t值,若不存,在请说明理由.
(1)求证:DM=BM;
(2)求MH的长;
(3)如图2,动点P从点A出发,沿折线ABC方向以2个单位/秒的速度向终点C匀速运动,设△PMB的面积为S(S≠0),点P的运动时间为t秒,求S与t之间的函数关系式;
(4)在(3)的条件下,当点P在边AB上运动时是否存在这样的t值,使∠MPB与∠BCD互为余角,若存在,则求出t值,若不存,在请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/17/2184394278289408/2189463262978048/STEM/ed81e58b906641a385f1bc85121320b2.png?resizew=576)
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名校
【推荐1】如图,在
中,
⊥弦
,垂足为E.请仅用无刻度的直尺按下列要求作图(保留作图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/abbfe6e5-0049-43a9-93b7-8bbe04eb2196.png?resizew=237)
(1)在图1中作弦
,使
;
(2)在图2中作矩形
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598c4ff9fc8518fa4829e39254d3f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/28/abbfe6e5-0049-43a9-93b7-8bbe04eb2196.png?resizew=237)
(1)在图1中作弦
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2142f4d63b5fc2f224fa954b8631ad3.png)
(2)在图2中作矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e7e8a8aa32993acc2f83f6e6113d3.png)
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【推荐2】如图,在平面直角坐标系中,
的三个顶点坐标分别为
,
,
,仅用无刻度的直尺在给定的
的网格中按要求画图(画图过程用虚线表示,画图结果用实线表示).
(1)将线段
绕点
逆时针旋转
,画出对应的线段
;
(2)在
轴的正半轴上画点
,使
;
(3)过点
画线段
,使
,且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3738bb3fced399273145e04ec3955b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20a748e7d78ccc3f7766fa58097ae0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c388f2604da379a588f8c5b4a6a767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10fac82e4a2a97fb7d42387827b1f5d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/21/4aa9252c-1f2c-483c-9caa-ef5a23a474e6.png?resizew=219)
(1)将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/03902478df1a55bc99703210bccab910.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28cfc331a43a3956d438d8093e7547d3.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476b0b8378f4b0f73f3dc5d84d89f616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
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