名校
1 . 如图,在正方形
中,将边
所在直线绕点
逆时针旋转
度得到直线
,作点
关于直线
的对称点
,连接
.
(2)求
的度数;
(3)延长
分别交直线
于点
,试探究:线段
和
之间的数量关系,并证明.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0366806a0974645702ace8bc6d3d5671.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f4ea9203ad9cd37c444cf1867c8746.png)
(3)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51922d3de043fc353d6a93d6454f750.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82d579a717399137b8c6d475d33cd4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e2d8259a8b314e3db1fa33b027abca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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2 . 如图,
是等边三角形,D,E两点分别在边
,满足
,
与
交于点F.
的度数;
(2)以C为中心,将线段
顺时针旋转
得到线段
,连接
,点N为
的中点,连接
.
①依题意补全图形;
②若
,求k的值.
![](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/3eac6f98ed81727dc5f6699ea5117fff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ee1c8b8f17e6adfe29201544ee304c.png)
(2)以C为中心,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
①依题意补全图形;
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37953612dfcc30c160aaa221ff4876ef.png)
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3 . 我们知道等腰三角形的“三线合一”定理,即:等腰三角形(前提)的顶角平分线、底边上的中线、底边上的高互相重合.
我们也可以逆用“三线合一”定理,证明这个三角形是等腰三角形,即:在三角形中,则这个三角形是等腰三角形(结论).
选择下面一种情况,完成证明.
选择情况:_____________.
证明:
我们也可以逆用“三线合一”定理,证明这个三角形是等腰三角形,即:在三角形中,则这个三角形是等腰三角形(结论).
选择下面一种情况,完成证明.
情况一 | 情况二 | 情况三 |
已知:如图,在![]() ![]() ![]() | 已知:如图,在![]() ![]() ![]() | 已知:如图,在![]() ![]() ![]() ![]() |
证明:
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4 . 如图,双骄制衣厂在厂房
的周围租了三幢楼
、
、
作为职工宿舍,每幢宿舍楼之间均有笔直的公路相连,并且厂房
与每幢宿舍楼之间也有笔直公路相连,且
.已知厂房
到每条公路的距离相等.
(1)则点
为
三条 _________ 的交点(填写:角平分线或中线或高线);
(2)如图设
,
,
,
,
,
,现要用汽车每天接送职工上下班后,返回厂房停放,那么最短路线长是 ____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1b4e58d374035caab3500696a4c797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(1)则点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
(2)如图设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a381009232d8745a8ab0df968d9f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e8b9bc91548db1a5ce23f047bd59627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49df9932c562db126b7cc006fbb6b209.png)
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5 . 如图,在正方形
中,E、F分别为
和
上的点,作
于M.
;
(2)在
上截取
,连接
,G为
中点,连接
,
.
①依题意补全图形;
②用等式表示线段
和
的数量关系,并证明.
![](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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590f5c235ef2d9cf1e12c2f346c076d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dccae658474d434fd8a12e8015f9616b.png)
(2)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5bba25a314fb799efba2895cb1f1f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
①依题意补全图形;
②用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
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2024-04-16更新
|
151次组卷
|
3卷引用:北京市清华大学附属中学2023-2024学年九年级下学期月考数学试题
名校
6 . 已知:在
中,
,
.
,将线段
绕点
逆时针旋转
得到
,连接
、
,
的平分线交
于点
,连接
.
求证:
;
求证:
;
(2)在图
中,若将线段
绕点
顺时针旋转
得到
,连结
、
,连结
,请补全图形,若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2226397b9bdbc77087433b05fb61209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b6771d1a8b599e2e6f8525a09ebb4c.png)
(2)在图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](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/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7511a0b486dc69365305de43459703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2024-04-15更新
|
426次组卷
|
3卷引用:2024年北京市东城区汇文中学中考一模数学试题
名校
7 . 如图,以点O为对称中心作矩形
,
为其对角线.点M、N分别在矩形的边
、
上,且直线
经过点O,过点D作
于H,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/f32e1559-f146-40d8-b185-42a5ca2c9e04.png?resizew=163)
(1)若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d715af2d0f55f1f8855361afee3fd0f.png)
______
;
(2)在(1)的条件下,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a447cd7d35c87c29590a75468adcaf3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/3/f32e1559-f146-40d8-b185-42a5ca2c9e04.png?resizew=163)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfb6ce695187d788d4c3d73db75f1ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d715af2d0f55f1f8855361afee3fd0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b34d97248691efc7a92bdd3ec5dab082.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97bd1bbf25dab6e67584122720f8308f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
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8 . 在
中,
,点D在
的内部,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7a1bc2d5-821b-41cc-9696-04ee6acdc4da.png?resizew=233)
(1)如图1,线段
的延长线交
于点E,且
,求
的度数;
(2)如图2,点F在线段
的延长线上,连接
交射线
于点M,且M为
的中点,试猜想线段
与
之间的数量关系并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc2f5f6d9efe3852a2329ea927abcf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4a2a127d89d50d3fde881a9b58ef0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296fca4fd76d5ff2d0e63ea7e4d64665.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/7a1bc2d5-821b-41cc-9696-04ee6acdc4da.png?resizew=233)
(1)如图1,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(2)如图2,点F在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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9 . 在平面直角坐标系
中,对于点
和点A,给出如下定义:将点A绕点K顺时针旋转
,得到点B,作点B关于直线
的对称点C,则称点C为点A关于点K的“转折点”.
(1)求点
关于点K的转折点Q的坐标.
(2)已知点
,如果M关于K的转折点是N,
①当M,K,N三点在同一条直线上时,
______.
②当
时,直接写出m的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84457a86117f540c03d6d330cfd27adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bc313f73ba34b49cf9fd322d8835e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/4157af0f-2000-4bf3-838b-6cda7a1bf09d.png?resizew=291)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff522ade58e82f6fe67b014309e90db8.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897b092ac0082e02cbf8dd821a05fad9.png)
①当M,K,N三点在同一条直线上时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/955a331f0c2af16dd2a20a0ed9087071.png)
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10 . 在
中,
,
,D是
边的中点.点E为线段
上的动点(不与点B,D重合),将线段
绕点A顺时针旋转
得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/fee7fac1-594f-48b0-80a1-ddc4bfed9db6.png?resizew=168)
(1)依题意补全图形;
(2)用等式表示线段
之间的数量关系,并说明理由.
(3)取
中点G,连接
,判断在点E运动过程中,
的大小是否变化,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/cb2cf0e95fdf1fd8a5b01d3dfd905e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e28fb89d4040f0436a6f9489903d3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/fee7fac1-594f-48b0-80a1-ddc4bfed9db6.png?resizew=168)
(1)依题意补全图形;
(2)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f67162cd729a086c50614c4350b351.png)
(3)取
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8349b1776a38935422a941674e1fc39.png)
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