1 . 如图,在正方形ABCD中,AB=12,点E在边BC上,BE=EC,将△DCE沿DE对折至△DFE,延长EF交边AB于点G,连接DG、BF,给出以下结论:①△DAG≌△DFG;②BG=2AG;③BF∥DE;④△EBF≌△DEG.其中所有正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987055620390912/2988378161553408/STEM/5203666482c34a6e95eb783c7e00a30f.png?resizew=180)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2987055620390912/2988378161553408/STEM/5203666482c34a6e95eb783c7e00a30f.png?resizew=180)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次
2 . 如图,已知
,
是
的平分线,
是射线
上一点,
.动点
从点
出发,以
的速度沿
水平向左作匀速运动,与此同时,动点
从点
出发,也以
的速度沿
竖直向上作匀速运动.连接
,交
于点
.经过
、
、
三点作圆,交
于点
,连接
、
.设运动时间为
,其中
.
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982188453380096/2987601482252288/STEM/0e136d3a-8287-47f9-af25-7ef5756db1bf.png?resizew=233)
(1)求
的值;
(2)是否存在实数t,使得线段
的长度最大?若存在,求出t的值;若不存在,说明理由.
(3)在点P,点Q运动过程中,四边形
的面积是否发生改变,如果变,请说明理由;如果不变,请求出四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a563c50a7f6d10fa46339d7107fc85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce62bfefacedc6efc521bddf80ea8155.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/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be99fa94a1f3e4964fcc13a14fab9ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/350e954f629c1901a5cec03558319e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052fc4d2a1d08dc58e6264f32a859f6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/18/2982188453380096/2987601482252288/STEM/0e136d3a-8287-47f9-af25-7ef5756db1bf.png?resizew=233)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e32aae7b7c2e1f0deb5b25693c548e.png)
(2)是否存在实数t,使得线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)在点P,点Q运动过程中,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ebabbf6a3b6da882eb237eefd61b26.png)
您最近一年使用:0次
2022-05-26更新
|
138次组卷
|
2卷引用:2022年贵州省毕节市七星关区中考数学二轮模拟试题
3 . 如图,
中,
,以
为直径的
与
相交于点
,与
的延长线相交于点
,过点
作
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/4697f8c2-9bd7-40a7-93e8-a90e6a251d5e.png?resizew=208)
(1)求证:
是
的切线;
(2)若
,
,则
______ .
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/761a77e11e1e45c2a8b2d34d22cf8e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/4697f8c2-9bd7-40a7-93e8-a90e6a251d5e.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a31929917293d9f4bd34092e1a5c750f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3505caf94539d51c4edba53a78ad0d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
您最近一年使用:0次
2022-05-25更新
|
117次组卷
|
2卷引用:2022年贵州省黔东南州中考数学模拟试题
4 . 数学实践活动,是一种非常有效的学习方式.通过活动可以激发我们学习兴趣,提高动手动脑能力,拓展思维空间,丰富数学体验.让我们一起动手来折一折、转一转、剪一剪,体会活动带来我们的乐趣.
折一折:将正方形纸片
折叠,发现
、
都落在对角线
上,展开得折痕
、
,连接
,如图1
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/4898928116df49668fe624691fba74b3.png?resizew=131)
(1)
______°,写出图中两个等腰三角形:_____(不需要添加字母);
(2)转一转:将图1中
绕点A旋转,使它的两边分别交边
、
于点
、
,连接
,如图2,线段
、
、
之间的数量关系为______;
(3)连接正方形对角线
,如图2中的
的边
、
分别交对角线
于点
、点
,如图3,则
______;
(4)剪一剪:将图3中的正方形纸片沿对角线
剪开,如图4.求证:
.
折一折:将正方形纸片
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/0e3b1549bdd34903ba634bd7d6a487b6.png?resizew=387)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321958912/STEM/4898928116df49668fe624691fba74b3.png?resizew=131)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e569f82eb96d237501ed0fba536e9ac4.png)
(2)转一转:将图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e31edc5b71c488ca9942d70d9298f01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
(3)连接正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7023ec0f513c7d0ef86859a5ede54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/94874d85399fc67d9d86bbb89acadeca.png)
(4)剪一剪:将图3中的正方形纸片沿对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc386f4abe6ec5082f9507c91ddc16d.png)
您最近一年使用:0次
5 . 如图,
为
的直径,
为
上一点,连接
,
,
为
延长线一点,连接
,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321770496/STEM/ee9f5eea-9c9c-4eca-a903-d149e5f9249a.jpg?resizew=233)
(1)求证:
是
的切线;
(2)若
的半径为
,
的面积为
,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/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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afbbf470efc0ca30e0f5bbc5cb5bad1c.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982793640869888/2984942321770496/STEM/ee9f5eea-9c9c-4eca-a903-d149e5f9249a.jpg?resizew=233)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
6 . 如图,△ABC中,∠ABC=90°,以AB为直径作☉O交AC于点D,取BC中点E,连接DE并延长,与AB的延长线交于点F,连接BD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b8023f3a-0527-49aa-9f67-a3feaa24c10b.png?resizew=187)
(1)求证:DF是☉O的切线;
(2)如果
,求
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/22/b8023f3a-0527-49aa-9f67-a3feaa24c10b.png?resizew=187)
(1)求证:DF是☉O的切线;
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59f14d21b18837991bb0b294d24633a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
您最近一年使用:0次
2022-05-20更新
|
311次组卷
|
3卷引用:2022年贵州省毕节市大方县中考数学二轮模拟试题
7 . 如图,在
中,点D,E分别是AB,AC的中点,若
的面积是
,则四边形BDEC的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/2469fa8a-ca7e-40a6-ba83-5a8e59ca4f45.png?resizew=134)
![](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/38309217f0970107f6f6e65a4c77bae6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/19/2469fa8a-ca7e-40a6-ba83-5a8e59ca4f45.png?resizew=134)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-05-19更新
|
350次组卷
|
7卷引用:贵州省贵阳市贵安区高峰中学2022-2023学年九年级上学期期中数学试题
贵州省贵阳市贵安区高峰中学2022-2023学年九年级上学期期中数学试题2022年福建省漳州市初中毕业班第二次质量检测数学试卷(已下线)专题4.2.3 相似三角形的性质(专项训练)-2022-2023学年九年级数学上册《同步考点解读·专题训练》(北师大版)(已下线)(挑战压轴)专项6.2 相似三角形种A字型(2种类型)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)(挑战压轴)专项27.2 相似三角形种A字型(2种类型)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(人教版)(已下线)专题6.4 相似三角形的性质(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(苏科版)(已下线)专题27.2.2 相似三角形的性质(专项训练)-2022-2023学年九年级数学下册《同步考点解读·专题训练》(人教版)
8 . 在△ABC中,AB=AC,以AB为直径的⊙O与BC交于点D.过D点作DE⊥AC,交AC于点E,交AB的延长线于点F,
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980551598972928/2982719324422144/STEM/82d1f6ad-c00f-4112-8a59-21bd49e13432.png?resizew=136)
(1)求证:EF是⊙O的切线;
(2)若FD=4,AC=6,求BF的长.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980551598972928/2982719324422144/STEM/82d1f6ad-c00f-4112-8a59-21bd49e13432.png?resizew=136)
(1)求证:EF是⊙O的切线;
(2)若FD=4,AC=6,求BF的长.
您最近一年使用:0次
2022-05-19更新
|
134次组卷
|
2卷引用:2022年贵州省白云区中考适应性考试数学试题
9 . 如图,已知
,
,点M、N分别是
、
的中点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d025dec80fc944fcc2fd3076984b13.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61291dca712701e08ff421ef334b371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb302f815f606fd743ab65a772e545d.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/e5d025dec80fc944fcc2fd3076984b13.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/0164ac38-e1f1-4251-a481-05549f242887.png?resizew=362)
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10 . 如图,在方格纸中,点A、B、C、D都在方格纸的交点处,线段
与
相交于点P,则线段
等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9b65a7d8-8e66-45b0-9677-c714d5ea64e7.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e724c7d093b291a43eb1d797160ad982.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/20/9b65a7d8-8e66-45b0-9677-c714d5ea64e7.png?resizew=195)
A.1∶1 | B.2∶3 | C.![]() | D.4∶3 |
您最近一年使用:0次
2022-05-19更新
|
125次组卷
|
2卷引用:2022年贵州省白云区中考适应性考试数学试题