数学课上,有这样一道探究题.
如图,已知
中,
,
,
,点
为平面内不与点
、
重合的任意一点,将线段
绕点
顺时针旋转
,得线段
,
、
分别是
、
的中点,设直线
与直线
相交所成的较小角为
,探究
的值和
的度数与
、
、
的关系,请你参与学习小组的探究过程,并完成以下任务:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/5537e95a-580a-4020-bcb4-0da39a5408e0.png?resizew=590)
(1)填空:
【问题发现】
小明研究了
时,如图1,求出了
__________,
__________;
小红研究了
时,如图2,求出了
__________,
__________;
【类比探究】
他们又共同研究了
时,如图3,也求出了
;
【归纳总结】
最后他们终于共同探究得出规律:
__________(用含
、
的式子表示);
__________(用含
的式子表示).
(2)求出
时
的值和
的度数.
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02adb59f0d7889cb04237104445c5766.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890aea25780f7ba34adb23e799808462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b288f6d1c197fd842e3e3cd9e2c1cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2d7cae9b4fe35ecbe84906c1f80fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/9/5537e95a-580a-4020-bcb4-0da39a5408e0.png?resizew=590)
(1)填空:
【问题发现】
小明研究了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d02d80d4e2f6f984036bd22a1a2077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2d7cae9b4fe35ecbe84906c1f80fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
小红研究了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629be4a6de577f13c9b0a524e7a5e383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2d7cae9b4fe35ecbe84906c1f80fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
【类比探究】
他们又共同研究了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0174ecb3effe04d6137463dcad183c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2d7cae9b4fe35ecbe84906c1f80fa6.png)
【归纳总结】
最后他们终于共同探究得出规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b69c4cf9e88059eb1e6e47a27659d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ca3f0a4b2d06539e74594736881aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0174ecb3effe04d6137463dcad183c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2d7cae9b4fe35ecbe84906c1f80fa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
22-23九年级上·山西运城·期末 查看更多[6]
山西省运城市运康中学校2022-2023学年九年级上学期期末考试数学试卷2023年广东省深圳布心中学中考模拟数学试题(已下线)九年级数学期末真题【考题猜想,压轴60题21个考点专练】-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)(已下线)猜想03旋转综合题(3种常见题型专练)-2023-2024学年九年级数学上学期期末考点大串讲(人教版)(已下线)清单03旋转(12个考点梳理+题型解读+核心素养提升+中考聚焦)-2023-2024学年九年级数学上学期期末考点大串讲(人教版)(已下线)专题14解答压轴题2(精选80道) -【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(苏科版)
更新时间:2023-02-07 11:40:47
|
相似题推荐
解答题-证明题
|
较难
(0.4)
真题
【推荐1】数学兴趣小组探究了以下几何图形.如图①,把一个含有
角的三角尺放在正方形
中,使
角的顶点始终与正方形的顶点
重合,绕点
旋转三角尺时,
角的两边
,
始终与正方形的边
,
所在直线分别相交于点
,
,连接
,可得
.
绕点C逆时针旋转
得到
,同时得到点
在直线
上.求证:
;
【探究二】在图②中,连接
,分别交
,
于点
,
.求证:
;
【探究三】把三角尺旋转到如图③所示位置,直线
与三角尺
角两边
,
分别交于点
,
.连接
交
于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cbeac5798a155ac8649f1236fe451d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d9561eaa5f17b287d78aba393d2d038.png)
【探究二】在图②中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7616f8e5b121397713ac898afdc0c599.png)
【探究三】把三角尺旋转到如图③所示位置,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b1f499256b4929116b5b3d82222e6b.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,
是
的直径,弦
于点
,
为
上一点,
,连接
分别交
,
于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/4431bb09-3cd0-4849-85c0-e41ef67db809.png?resizew=163)
(1)求证:
;
(2)若
,且
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3503502077c4c771a0617779302789d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/4431bb09-3cd0-4849-85c0-e41ef67db809.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2667fc9a2affbfad80ed5bd4210aea.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3f97cff055b8e8cb82cd4c24176e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ad9ba9da6c5ae5f23eda257993d1c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在平行四边形ABCD中,点G是线段AB上一点,连接CG、DG,满足CG=CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/8b97da35-3bef-4f2a-90d0-645edd411c35.png?resizew=297)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9795a840-c42e-43d6-818d-6021b0a403e2.png?resizew=310)
(1)如图1,过点G作GH⊥CD于点H,若AB=8,GH=2
,求DG;
(2)如图2,若∠DAB=60°,∠DAB的角平分线交CD于点E,过点E作EF∥AD,满足EF+AG=AD,连接DF、CF,求证:∠DCF=∠GCF.
拓展:如图,正方形ABCD的边长为4
,E为BC上一点,且BE=
,F为AB边上的一个动点,连接EF,以EF为边向右侧作等边△EFG,连接CG,直接写出CG的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/8b97da35-3bef-4f2a-90d0-645edd411c35.png?resizew=297)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/9795a840-c42e-43d6-818d-6021b0a403e2.png?resizew=310)
(1)如图1,过点G作GH⊥CD于点H,若AB=8,GH=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
(2)如图2,若∠DAB=60°,∠DAB的角平分线交CD于点E,过点E作EF∥AD,满足EF+AG=AD,连接DF、CF,求证:∠DCF=∠GCF.
拓展:如图,正方形ABCD的边长为4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/c788a7ba-b32f-47fc-8ebb-14963e3869ca.png?resizew=222)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图1,把一块含30°的直角三角板ABC的BC边放置于长方形直尺DEFG的EF边上.
(2)现把三角板绕B点逆时针旋转n°.如图2,当0<n<90,且点C恰好落在DG边上时,
①请直接写出∠2= °(结果用含n的代数式表示);
②若∠1与∠2恰好有一个角是另一个角的
倍,求n的值.
(3)若把三角板绕B点顺时针旋转n°.当0<n<180时,是否会存在三角板某一边所在的直线与直尺(有四条边)某一边所在的直线平行?如果存在,请直接写出所有n的值;如果不存在,请说明理由.
(2)现把三角板绕B点逆时针旋转n°.如图2,当0<n<90,且点C恰好落在DG边上时,
①请直接写出∠2= °(结果用含n的代数式表示);
②若∠1与∠2恰好有一个角是另一个角的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c55e4f3eda94bc505f103b10bc1fee7.png)
(3)若把三角板绕B点顺时针旋转n°.当0<n<180时,是否会存在三角板某一边所在的直线与直尺(有四条边)某一边所在的直线平行?如果存在,请直接写出所有n的值;如果不存在,请说明理由.
您最近一年使用:0次