在矩形
中,
,
,以点
为旋转中心,逆时针旋转矩形
,旋转角为
,得到矩形
,点
、点
、点
的对应点分别为点
、点
、点
.
落在
边上时,直写出线段
的长度为______;
(2)如图②,当点
落在线段
上时,
与
相交于点
,连接
.
①求证:
;
②求线段
的长度.
(3)如图③设点
为边
的中点,连接
,
,在矩形
旋转过程中,
的面积是否存在最大值?若存在请直接写出这个最大值;若不存在请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0c6b3ac303e83e204a619ac3d5e1bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.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/8455657dde27aabe6adb7b188e031c11.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(2)如图②,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44d22c0a1ba18fc3cd342c5ef269e66.png)
②求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
(3)如图③设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fa7dd60b071d132afbfdaf170c1020.png)
22-23八年级下·江苏泰州·阶段练习 查看更多[5]
江苏省泰州市姜堰区姜堰区实验初级中学2022-2023学年八年级下学期月考数学试题江苏省南京市2023-2024学年八年级下学期第一次月考模拟练习数学试题江苏省镇江市丹阳市正则集团2023-2024学年八年级下学期数学3月月考试题2024年山东省济南市中考数学模拟预测考试题(已下线)考题猜想06 八年级期中必刷题(压轴必刷48题13种题型)-2023-2024学年八年级数学下学期期中考点大串讲(苏科版)
更新时间:2024-03-04 18:07:47
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相似题推荐
解答题-证明题
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名校
【推荐1】如图,
是
的切线,
是切点,
是直径,
是弦,连接
、
,
与
相交于点
,且
.
(1)求证:
是
的切线;
(2)若
,求
的值.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/a10e95d0-28bd-4e31-8742-26d1832ce9b9.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c78a8d05a206c3660450534885b261a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a2a3ca97740b27193a7289833819ee.png)
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【推荐2】阅读与思考
下面是小明的数学学习笔记,请仔细阅读并完成相应的任务:
通过构造全等三角形来解决图形与几何中的问题
在图形与几何的学习中常常会遇到一些问题无法直接解答,需要作辅助线构造全等三角形才能得到解决,比如下面的题目中出现了角平分线和垂线段,我们可以通过延长垂线段与三角形的一边相交,构造全等三角形,再运用全等三角形的性质解决此问题.
例:如图1,D是
内的点,且
平分
,
,连接
.若
的面积是10,求图中阴影部分的面积.
该问题的解答过程如下:
解:如图2,延长
交
于点E.
∵
平分
,
∴
.
∵
,
∴
.
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0826865acec5e7bfa48c38e86e4d5a4.png)
∴
.
∴
(依据*),
.
任务:
(1)上述解答过程中的“依据*”是指 ;
(2)请将上述解答过程的剩余部分补充完整;
(3)如图3,在
中,
,
,
平分
交
于点D,
交
的延长线于点E,连接
.若
,请直接写出
的长.
下面是小明的数学学习笔记,请仔细阅读并完成相应的任务:
通过构造全等三角形来解决图形与几何中的问题
在图形与几何的学习中常常会遇到一些问题无法直接解答,需要作辅助线构造全等三角形才能得到解决,比如下面的题目中出现了角平分线和垂线段,我们可以通过延长垂线段与三角形的一边相交,构造全等三角形,再运用全等三角形的性质解决此问题.
例:如图1,D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/4ac111ab-f7eb-49ef-8e04-98520d21e11a.jpg?resizew=132)
该问题的解答过程如下:
解:如图2,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/d0e4fd31-8325-4e30-9bed-d40b26f88fc8.jpg?resizew=133)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0691c8f8dfd56b54cc157f6d913d01f3.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8814717947548365b8adf2e7dd1686e1.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0826865acec5e7bfa48c38e86e4d5a4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46473b4a35f3ef0db298cd053dcb61dc.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef0e66cb616be2c3b04f940f687bb2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/465c233cde12cb1fcbb4e0bf6fd11fc3.png)
任务:
(1)上述解答过程中的“依据*”是指 ;
(2)请将上述解答过程的剩余部分补充完整;
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d2231c7a2875ab6d423dff3ead4069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/9cb7f7c0-8049-44ca-91e8-9a100a5abf7b.jpg?resizew=102)
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【推荐1】如图,在矩形ABCD中,AB=2,AD=
,E是CD边上的中点,P是BC边上的一点,且BP=2CP,连接EP并延长交AB的延长线于点F.
(1)求BF;
(2)判断EB是否平分∠AEC,并说明理由;
(3)连接AP,不添加辅助线,试证明△AEP≌△FBP,直接写出一种经过两次变换的方法使得△AEP与△FBP重合.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求BF;
(2)判断EB是否平分∠AEC,并说明理由;
(3)连接AP,不添加辅助线,试证明△AEP≌△FBP,直接写出一种经过两次变换的方法使得△AEP与△FBP重合.
![](https://img.xkw.com/dksih/QBM/2020/6/12/2482845086736384/2484694493421568/STEM/9ce04390d9e14f83b4fd621d8353bc06.png?resizew=189)
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【推荐2】如图,正方形ABCD中,AB=6,点E在边CD上,且tan∠DAE=
,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG、CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/1bc104f2-13e3-46c6-8e1b-60396000504e.png?resizew=191)
(1)求证:△ABG≌△AFG;
(2)求BG的长;
(3)求sin∠FCE的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/27/1bc104f2-13e3-46c6-8e1b-60396000504e.png?resizew=191)
(1)求证:△ABG≌△AFG;
(2)求BG的长;
(3)求sin∠FCE的值.
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【推荐1】如图,矩形
中,
.
是边
上一动点(不与点
重合),延长
到
,使
,
,
交于点
,连接
并延长交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/e0aabcd4-3d7f-4d1e-bd05-6ce7641f2f8d.png?resizew=326)
(1)若
,求证:
;
(2)探究:当点
运动时,点
的位置是否发生变化?请说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65fc998d33cdf37c272f79cfd64b7b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b694bf5ec20ec34ccbc12a74996c7eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/26/e0aabcd4-3d7f-4d1e-bd05-6ce7641f2f8d.png?resizew=326)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e2b5060e1311f27bcbde24dac84db8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5f38466213a8a2d11ac1ad791aa9d1b.png)
(2)探究:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐2】如图,在矩形ABCD中,∠BAD 的平分线交BC于点E,AE=AD,作DF⊥AE于点F.
(1)求证:AB=AF;
(2)连BF并延长交DE于G.
①EG=DG;
②若EG=1,求矩形ABCD的面积.
(1)求证:AB=AF;
(2)连BF并延长交DE于G.
①EG=DG;
②若EG=1,求矩形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/2020/8/14/2527567654494208/2531232591642624/STEM/ff9adb6e3ac14e69a62fea94e40ff4fb.png?resizew=166)
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【推荐1】【问题初探】
(1)在数学活动课上,李老师给出如下问题:如图1,在
中,
,D为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的右侧,连接
,你能得到哪些结论呢?
小明说:“在点D的运动过程中,只要保证
在边
的右侧,
的度数是固定的,我能求出
的度数”;
小强说:“在点D的运动过程中,只要保证
在边
的右侧,我能得到从点
发出的三条线段
,
,
数量关系”.
小涛说:“我利用
,如图2,在
上截取
,连接
,再利用旋转的性质,就可以得到小明和小强的结论”.
请你根据小涛的思路,求
的度数,并探究线段
,
,
的数量关系.
【类比分析】
(2)李老师发现同学们都利用了转化的思想,转化角,转化线段,为了帮助同学们更好地感悟转化思想,李老师将图1进行变换,并提出下面问题,请你解答.
如图3,在
中,
,
为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的左侧,连接
,过
作
于点
,求证:
..
【学以致用】
(3)如图4,在
中,
,
为
上的动点,当
时,连接
,将线段
绕点
逆时针旋转
得到线段
,且
在边
的右侧,连接
,
,过
作
于
,线段
的中点为
,连接
,若
,求四边形
的面积.
(1)在数学活动课上,李老师给出如下问题:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
小明说:“在点D的运动过程中,只要保证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
小强说:“在点D的运动过程中,只要保证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
小涛说:“我利用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14833dbeed409b33acd4c9071fd0be36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
请你根据小涛的思路,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
【类比分析】
(2)李老师发现同学们都利用了转化的思想,转化角,转化线段,为了帮助同学们更好地感悟转化思想,李老师将图1进行变换,并提出下面问题,请你解答.
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6834a0601cbb9cb4b6065d25c370216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c9bff988abfbb5445c477e3f4a07ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed0b2b203b943bec29c4f3c2d1a8971.png)
【学以致用】
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb350b8e577a7b6712031a3b5b98309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.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/3d0091935a8ea039d96fead15167ddea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图1,点O为直线AB上一点,过点O作射线OC,使∠AOC=60°.将一把直角三角尺的直角顶点放在点O处,一边OM在射线OB上,另一边ON在直线AB的下方,其中∠OMN=30°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/a02f6e73-a7b4-4082-a1c5-2e9a6df3d912.png?resizew=452)
(1)将图1中的三角尺绕点O顺时针旋转至图2,使一边OM在∠BOC的内部,且恰好平分∠BOC,求∠CON的度数;
(2)将图1中的三角尺绕点O按每秒6°的速度绕点O沿顺时针方向旋转一周,OC也以每秒1°的速度绕点O顺时针方向旋转,当三角尺停止运动时,OC也停止运动.
①在旋转的过程中,问运动几秒时,边MN恰好与射线OC平行;
②将图1中的三角尺绕点O顺时针旋转至图3,使ON在∠AOC的内部,请探究∠AOM与∠NOC之间的数量关系(直接写出结果).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/a02f6e73-a7b4-4082-a1c5-2e9a6df3d912.png?resizew=452)
(1)将图1中的三角尺绕点O顺时针旋转至图2,使一边OM在∠BOC的内部,且恰好平分∠BOC,求∠CON的度数;
(2)将图1中的三角尺绕点O按每秒6°的速度绕点O沿顺时针方向旋转一周,OC也以每秒1°的速度绕点O顺时针方向旋转,当三角尺停止运动时,OC也停止运动.
①在旋转的过程中,问运动几秒时,边MN恰好与射线OC平行;
②将图1中的三角尺绕点O顺时针旋转至图3,使ON在∠AOC的内部,请探究∠AOM与∠NOC之间的数量关系(直接写出结果).
您最近一年使用:0次