名校
1 . 如图,在平面直角坐标系中,抛物线
交
轴于
两点(点
在点
的左边),交
轴于点
.
(1)直接写出
三点的坐标;
(2)若抛物线上有一点
,求点
的坐标.
(3)如图2,点P是第一象限抛物线上一点,过点P的直线
与抛物线交于另一点Q,连接
,分别交
轴于
两点,若
,探究
之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92738aadeac1e3d3d8e919772bce727.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/2/b4b2bec6-ca5d-4892-a2bb-020156b1dcae.png?resizew=359)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
(2)若抛物线上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e22c3d1ce0daafae932b65e81a04ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,点P是第一象限抛物线上一点,过点P的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f09dc7f2edf09cde49b9560d7a7365d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53d223a09481973825c5e87ce2f5c03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b89e104e2d1d957fb383baeb70756b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
您最近一年使用:0次
名校
2 . 定义:两个相似等腰三角形,如果它们的底角有一个公共的顶点,那么把这两个三角形称为“关联等腰三角形”、如图,在
与
中,
,且
.所以称
与
为“关联等腰三角形”,设它们的顶角为a,连接
,则称
为“关联比”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/aed55e37-00ac-459e-b67c-ea53530af3c2.png?resizew=121)
下面是小颖探究“关联比”与a之间的关系的思维过程,请阅读后,解答下列问题:
(1)当
与
为“关联等腰三角形”,且
时,
①在图1中,若点E落在
上,则“关联比”
____________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/fae5bcb0-714a-4363-87ba-f9530187f2aa.png?resizew=111)
②在图2中,探究
与
的关系,并求出“关联比”
值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/fc5bae17-61fe-421e-8f47-edaf45c7c0e6.png?resizew=136)
(2)如图3,当
与
为“关联等腰三角形”,且
时,“关联比”
=______________;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/9060d882-59fc-4ee5-826d-436f30517c0f.png?resizew=150)
[迁移运用]
(3)如图4,
与
为“关联等腰三角形”.若
,
,点P为
边上一点,且
,点E为
上一动点,求点E自点B运动至点P时,点D所经过的路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a64cf634f51811e6bee01dd6f1010ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c30583f2a4aca915134f41b452e4e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8486294bdbad1f941f44474c5e42a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0a2b2b481d31e5e9d6cc93d9aa3fa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/aed55e37-00ac-459e-b67c-ea53530af3c2.png?resizew=121)
下面是小颖探究“关联比”与a之间的关系的思维过程,请阅读后,解答下列问题:
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
①在图1中,若点E落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0b250bf0958b11bbee1c88f7f83952b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/fae5bcb0-714a-4363-87ba-f9530187f2aa.png?resizew=111)
②在图2中,探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0a2b2b481d31e5e9d6cc93d9aa3fa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/fc5bae17-61fe-421e-8f47-edaf45c7c0e6.png?resizew=136)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0a2b2b481d31e5e9d6cc93d9aa3fa5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/9060d882-59fc-4ee5-826d-436f30517c0f.png?resizew=150)
[迁移运用]
(3)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ae8acaddb28f8a5a55eff086fd976.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/5ce7fa88-ff34-4b59-94b2-a25e5e5e8036.png?resizew=166)
您最近一年使用:0次
2022-11-20更新
|
294次组卷
|
5卷引用:山东省青岛市市南区青岛第七中学2022-2023学年九年级上学期期中数学试题
山东省青岛市市南区青岛第七中学2022-2023学年九年级上学期期中数学试题山东省青岛市即墨区2022-2023学年九年级上学期期中数学试题山东省青岛第二十六中学、第二十七中学2022-2023学年九年级上学期期中数学试题湖南省长沙麓山外国语实验中学2022-2023学年九年级上学期第三次月考数学试卷(已下线)山东省济南市高新区2022-2023学年九年级上学期期末数学试题变式题21-26
名校
3 . 实践与探究
操作一:如图①是一张矩形纸片,点E在边
上,把
沿直线
翻折,使点B落在对角线
上的点F处,连结
,且点E、F、D在同一直线上.
(1)若
,则
______°.
(2)当
时,求
的长.小明对求
的长进行了解答,下面是部分解答过程:
如图①,设
的长为x,则由折叠知,
,
.
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140457658138624/3142062346215424/STEM/0a2d945fa1ef46909b23429324c779f9.png?resizew=155)
∵四边形ABCD是矩形,∴
,
.
∴
,∴
,∴
.∴
.
请你补全余下的解答过程.
操作二:如图②,矩形纸片中,
,
,点G是
的中点,点E是
边上的一动点,将
沿
所在直线翻折得到
,连结
,则线段
的最小值是______.
操作一:如图①是一张矩形纸片,点E在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc55328866b81679c3918cde8382a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06df3b822800139fd3ba2cb1ceaeaf73.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
如图①,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3448f4d9eaf0b0ac5485b365e74f64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d82ec1fa6dbab2e53a217375d3420a9.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140457658138624/3142062346215424/STEM/0a2d945fa1ef46909b23429324c779f9.png?resizew=155)
∵四边形ABCD是矩形,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b08b7b0f2922cb80b7290321b19569.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed9a0ee867b23b113682c83b1fb26c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7da18d3186f64c18655be8cff5dff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473f689dfe8fcda5e990a9e50c8714e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ade06068471a9d76e32b417bef7551.png)
请你补全余下的解答过程.
操作二:如图②,矩形纸片中,
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3b07a8fb7f8bf24fb0cd0d9ccade9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80109f84d1dd3432514ffa836f51d37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2022/12/28/3140457658138624/3142062346215424/STEM/bbff798544ea47a29bbcca573a72ab10.png?resizew=190)
您最近一年使用:0次
2022-12-30更新
|
143次组卷
|
2卷引用:吉林省长春市朝阳区实验中学2022-2023学年九年级上学期期末数学试题
4 . 如图,
是
的直径,点
在
上,
平分
;
![](https://img.xkw.com/dksih/QBM/2022/11/5/3103244627836928/3109487691915264/STEM/648cfe6fef4a4676951d886850652f8b.png?resizew=261)
(1)当
半径
时,求
的长;
(2)探究
三边之间的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://img.xkw.com/dksih/QBM/2022/11/5/3103244627836928/3109487691915264/STEM/648cfe6fef4a4676951d886850652f8b.png?resizew=261)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7551011cfb75b26f35b07d6617c6a18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c39e37a3f40105e0ffb89aed892ef3d.png)
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5 . 在四边形
中,E、F分别是
、
边上的点,
与
交于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/4ecad8a3-8c2d-46f1-bf15-7a0b6e40a5b7.png?resizew=519)
(1)如图1,若四边形
是正方形,且
,求证:
;
(2)如图2,若四边形
是矩形,且
,求证:
;
(3)如图3,若四边形
是平行四边形,试探究:当
与
满足什么关系时,
成立?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/4ecad8a3-8c2d-46f1-bf15-7a0b6e40a5b7.png?resizew=519)
(1)如图1,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
(2)如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2753a0194119801844add1fbbe7745b.png)
(3)如图3,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a8e30f70325b5b14851b9377107ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2753a0194119801844add1fbbe7745b.png)
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6 . 综合与实践
问题情境:数学活动课上,王老师出示了一个问题:
如图1,在
中,
是
边的中线,延长
至点D,连接
,且
.求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/26aac397-e820-434a-b823-eaea4e6a617d.png?resizew=480)
(1)独立思考:请解答王老师提出的问题.
(2)实践探究:在原有问题条件不变的情况下,王老师增加下面的条件,并提出新问题,请你解答.
“如图2,F是
边的中点,连接
,将
绕点E顺时针旋转一定角度,交
于点M,交
于点N.在图中找出与
相等的线段,并证明.”
(3)问题解决:数学活动小组同学对上述问题进行特殊化研究之后发现,当射线EM经过点D时,若给出
的边长,则图3中所有已经用字母标记的线段长均可求.该小组提出下面的问题,请你解答.
“如图3,在(2)的条件下,当射线
经过点D时,
,求
的长.”
问题情境:数学活动课上,王老师出示了一个问题:
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fca376d53ebc6d1355fd8bb4a84405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cb302034aaafb4657073cc6fcb0992.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/11/26aac397-e820-434a-b823-eaea4e6a617d.png?resizew=480)
(1)独立思考:请解答王老师提出的问题.
(2)实践探究:在原有问题条件不变的情况下,王老师增加下面的条件,并提出新问题,请你解答.
“如图2,F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)问题解决:数学活动小组同学对上述问题进行特殊化研究之后发现,当射线EM经过点D时,若给出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8237e12e3e46a7383df36a56e2d3a31.png)
“如图3,在(2)的条件下,当射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2e0a4ba89eed26d2ce637e1a4fcc17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次
7 . 综合与实践
【经典再现】人教版八年级数学下册教科书69页14题:如图1,四边形
是正方形,点E是边
的中点,且
交正方形外角的平分线
于点F.求证
.(提示:取
的中点H,连接
.)
(1)请你思考题中的“提示”,这样添加辅助线的目的是为了构造出 ≌ ,进而得到
.
(2)【类比探究】
如图2,四边形
是矩形,且
,点E是边
的中点,
,且
交矩形外角的平分线
于点F,求
的值(用含n的式子表示);
(3)【综合应用】如图3,P为边
上一点,连接
,
,在(2)的基础上,当
,
,
时,请直接写出
的长.
【经典再现】人教版八年级数学下册教科书69页14题:如图1,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16f5621716bfef7a056a3f2712feb4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/1926f771-380c-41e9-957b-f44229cdc191.png?resizew=394)
(1)请你思考题中的“提示”,这样添加辅助线的目的是为了构造出 ≌ ,进而得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(2)【类比探究】
如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f86c920706035d943b6baa236762e0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114a2e56d9a32e3886fd517a85ede50d.png)
(3)【综合应用】如图3,P为边
![](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/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82065e77d6189040cd6090f6474f7c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efb8e9d8cebeb649409282247be087d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3864fbf8f38f0285c22abbd5e31f8d15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
2023-10-20更新
|
175次组卷
|
4卷引用:2023年河南省三门峡市中考二模数学试题
2023年河南省三门峡市中考二模数学试题(已下线)2023年河南省二模(几何综合2)广东省深圳市南科大附属光明凤凰学校2023-2024学年九年级上学期月考数学试题2023年河南省三门峡市灵宝市二模数学模拟试题
8 . 含30°角的直角三角板
中,
.将其绕直角顶点C顺时针旋转
角(
),得到![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
,边
与边
交于点D,过点 D作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
交
边于点E,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
边经过点B时,求
的度数;
(2)小明发现在三角板旋转的过程中,
度数是定值,他在探究过程中需证明:
.
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
度数的范围;
(3)设
的面积为S,当![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
时,求
的长,以点
为圆心,
为半径作
,并判断此时直线
与
的位置关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfaf332982efd5000be9bed0bdb6d22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3103a9141008afb6dff5564ee58f8be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e477724e91fad6273eb151496a6e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/25/12f10018-a0e5-418f-8c75-54b8c00b3c47.png?resizew=523)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc890342ba48792f572f99e3f8c033a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(2)小明发现在三角板旋转的过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd519bfe47895e5ed56e834039353e4a.png)
①如图2是旋转过程的一个位置,试完成相似的证明
②然后直接写出三角板旋转的过程中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d713d6649c9b42283b1a0b83ba34cc56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda95fdeb2571aab2e1d645efa65b1dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1b2210b77b2cf71d12fac1cbb6394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
您最近一年使用:0次
2023·四川巴中·中考真题
真题
解题方法
9 . 综合与实践.
和
中,
,且
,
,连接
,连接
交
的延长线于点O.
①
的度数是___________.
②
__________.
(2)类比探究.如图2,在
和
中,
,且
,连接
并延长交于点O.
①
的度数是___________.
②
___________.
(3)问题解决.如图3,在等边
中,
于点D,点E在线段
上(不与A重合),以
为边在
的左侧构造等边
,将
绕着点A在平面内顺时针旋转任意角度.如图4,M为
的中点,N为
的中点.
①试说明
为等腰三角形.
②求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.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/d40b319212a7e7528b053e1c7097e966.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a1ce777c38d86186c0ea5dd42b6672d.png)
(2)类比探究.如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a9bba638aa5db4131836328aac46e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c50ed3533d5274047cac354bf4e1fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15204b24dd62067316fee9abab2bf73.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a984d57770ddb0ac29599901f8cc26.png)
(3)问题解决.如图3,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
①试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d303c32af8831735d4e0f86fa45874.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18104b46692bd03c473fa81c38e49ca4.png)
您最近一年使用:0次
2023-06-16更新
|
1035次组卷
|
16卷引用:2023年四川省巴中市中考数学真题
(已下线)2023年四川省巴中市中考数学真题(已下线)专题19 图形的相似(含位似)-学易金卷:2023年中考数学真题分项汇编(四川专用)(已下线)专题22 几何压轴题-学易金卷:2023年中考数学真题分项汇编(四川专用)(已下线)专题13 三角形基础、全等三角形、等腰三角形和直角三角形-学易金卷:2023年中考数学真题分项汇编(四川专用)(已下线)专题15 多边形与平行四边形-学易金卷:2023年中考数学真题分项汇编(四川专用)(已下线)专题31图形的旋转(优选真题60道)-学易金卷:三年(2021-2023)中考数学真题分项汇编【全国通用】山东省菏泽市成武县育青中学2023-2024学年九年级上学期分班考试数学试题(已下线)2023年四川省成都市中考数学真题变式题24-26题广东省深圳市南山区桃源中学2023-2024学年九年级上学期期中数学试题广东省深圳市南山区南山外国语学校集团2023-2024学年九年级上学期期中数学试题(已下线)专题23 几何综合-学易金卷:三年(2021-2023)中考数学真题分项汇编(四川专用)(已下线)第5讲 探究题辽宁省沈阳市大东区2023-2024学年九年级上学期10月月考数学试题江苏省兴化市昭阳湖初级中学2023-2024学年九年级下学期月考数学试题2024年甘肃省天水市甘谷县部分学校九年级下学期一模数学模拟试题(已下线)培优冲刺01 三角形中的常见模型综合训练(14模型)-【查漏补缺】2024年中考数学复习冲刺过关(全国通用)
名校
解题方法
10 . 已知
是
的直径,
是
上一点,连接
,过点
作
于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/76b78fc0-bd38-410d-bd9b-9279b0b0cdeb.png?resizew=439)
(1)当点
为
上任意一点(点
除外)时,连接
并延长交
于点
,
与
的延长线交于点
(如图①).求证:
.
(2)李明证明(1)的结论后,又作了以下探究:当点
为
上任意一点(点A、D除外)时,连接
并延长交
于点
,连接
并延长与
的延长线在圆外交于点
,
与
相交于点
(如图②).连接
后,他惊奇的发现
.根据这一条件,可证
.请你帮李明给出证明.
(3)当点E为AB的延长线上或反向延长线上任意一点(点A、B除外)时,如图③、④所示,还有许多结论成立.请你根据图③或图④再写出两个类似问题(1)、(2)的结论(两角、两弧、两线段相等或不相等的关系除外)(不要求证明).
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/76b78fc0-bd38-410d-bd9b-9279b0b0cdeb.png?resizew=439)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fed84044b6f753353387a09e08469a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4a56cec492a2c8e3e20e2e4d208ff.png)
(2)李明证明(1)的结论后,又作了以下探究:当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5fd1fcfadce2999f0201e8f95afd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d2f8fa7cdfed384e8bc4dcb1478852.png)
(3)当点E为AB的延长线上或反向延长线上任意一点(点A、B除外)时,如图③、④所示,还有许多结论成立.请你根据图③或图④再写出两个类似问题(1)、(2)的结论(两角、两弧、两线段相等或不相等的关系除外)(不要求证明).
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2022-12-13更新
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2卷引用:湖南省长沙市南雅中学2022-2023学年九年级上学期第三次月考数学试卷