名校
1 . 如图,
是
的直径,
是
的切线,
交
于E,点D在
上,满足
.
![](https://img.xkw.com/dksih/QBM/2022/12/20/3134795409874944/3135764822507520/STEM/87d1e20fe28c42ec80049b3ad37ffc36.png?resizew=137)
(1)求证:
是
的切线;
(2)求证:
;
(3)若
,求
的值.
![](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/60ef95894ceebaf236170e8832dcf7e3.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://img.xkw.com/dksih/QBM/2022/12/20/3134795409874944/3135764822507520/STEM/87d1e20fe28c42ec80049b3ad37ffc36.png?resizew=137)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567e5ae19d4c906f682b33ff3ad57ed8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccae9245c20395195aa36d6bb4d74468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738a9b90d2dd1211573506389361c67a.png)
您最近一年使用:0次
2 . 如图1是一种可折叠手机平板支架,由托板、支撑板和底座组成,手机放置在托板上,图2是其侧面结构示意图.量得托板长
,支撑板长
,底座长
,托板AB固定在支撑板顶端点C处,托板AB可绕点C转动,支撑板CD可绕点D转动,当
时,点A到直线DE的距离是点C到直线DE的距离的2倍.为了观看舒适,把AB绕点C旋转,再将CD绕点D旋转,使点B与点E重合,则此时点A到直线DE的距离为______ cm.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a161b8cc4d117abb319aef255a624a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c310e8859d36c532f2074dde3d934d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdea020486c67882d85df6b7c413d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/990def0aa4dac7f5c4352a3cf7bdda22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/45018377-c518-4fe3-97c4-181232cbc1e5.png?resizew=250)
您最近一年使用:0次
名校
3 . 如图,点
是
内一点,连接
,
,
,点
,
,
分别是
,
,
的中点,已知
的面积是1,有以下结论:①
;②
;③
;④
.其中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61291dca712701e08ff421ef334b371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7eb30a63d510deeab3e7f1cc5fa6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa7477a4942332b8d6eb79ed710b2c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2eb41913d12742fa72f7d29da3c295.png)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2022-12-14更新
|
50次组卷
|
2卷引用:河北省保定市第十六中学2021-2022学年九年级上学期期末数学试题
4 . 如图,
的对角线
交于点O,点E在边
的延长线上,连接
,且
,
.求证:四边形
是矩形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c65319e9026d1db4d468f69fd8f9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d814a102121c96ec711db7d420d2659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/ef45c88f-378f-49f4-9168-6c808cd166b8.png?resizew=207)
您最近一年使用:0次
2022-12-09更新
|
80次组卷
|
5卷引用:陕西省榆林市神木市2021-2022学年九年级上学期期末考试数学试卷
5 . 如图,在四边形
中,
,点E在
上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/1b2f0971-50c2-4414-99a3-4cddf6284b1a.png?resizew=163)
(1)求证:
;
(2)若
,求
与
的周长之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52824c1b4ac567c27572092e97e479f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/1b2f0971-50c2-4414-99a3-4cddf6284b1a.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1dc13ee6ba3694a9c0e2a481e650749.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4dcc4a9bea61304e479a4781f6622a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
您最近一年使用:0次
2022-12-09更新
|
88次组卷
|
2卷引用:陕西省榆林市神木市2021-2022学年九年级上学期期末考试数学试卷
解题方法
6 . 如图1,在平面直角坐标系中,点A的坐标为
,B是x轴正半轴上一动点,以
为直径画
交x轴于点D,连接
,过点A作
交
于点E,连接
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/9220101a-4dc1-467a-9f80-e97646dbefd8.png?resizew=422)
(1)求
的度数.
(2)求证:
.
(3)如图2,连接
,过点C作
于点F,过点F作
交
的延长线于点G,设点B的横坐标为t.
①用含t的代数式表示
.
②记
,求S关于t的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16a8eb1d9555fc55ee79c707acb12f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c249d29683e01445f1ee602edf46e61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/9220101a-4dc1-467a-9f80-e97646dbefd8.png?resizew=422)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbaa2c83a4aac372fc35f1aec4ea7ae7.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80125e48498ac9c548732e2af1b1758d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e5ab4c023936ae1cfa2d7e1f0892d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
①用含t的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7a6901af6bf907d2baf1b42a0a704d.png)
②记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5743adeb0f23d8707276628a0b746076.png)
您最近一年使用:0次
2022-12-05更新
|
253次组卷
|
10卷引用:【新东方】 【2021.6.16】【omo】【初三下】【数学00112】
(已下线)【新东方】 【2021.6.16】【omo】【初三下】【数学00112】2021年浙江省宁波市余姚市初中学业水平考试适应性测试数学试题(已下线)浙江九年级上学期期末【压轴60题专练】(九上+九下)-2022-2023学年九年级数学考试满分全攻略(浙教版)(已下线)期末难点特训(二)与圆综合有关的压轴题-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(人教版)(已下线)期末难点特训(一)与圆综合有关的压轴题-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(浙教版)江苏省苏州市姑苏区2022-2023学年九年级上学期期中数学试题(已下线)专题09 圆与三角形、四边形综合-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(浙教版)(已下线)专题2.16 直线与圆的位置关系(全章复习与巩固)(培优篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(浙教版)(已下线)2023年上海市中考数学真题变式题20-25题江苏省泰州市海陵区民兴中英文学校2023-2024学年九年级上学期12月月考数学试题
7 . 如图,直线
与
相切于点B,弦
,连接
并延长,交
于点E,交
于点F,连接
并延长,交
于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c3984aaa-820d-410c-84e9-b3a2b479f469.png?resizew=245)
(1)求证:
;
(2)若
的半径
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38275b7b9be96359ebc4e1406a27cbc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c3984aaa-820d-410c-84e9-b3a2b479f469.png?resizew=245)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed01023accf784e139c8403514973aa7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999fc302a52625d35968c0c62bde135f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
您最近一年使用:0次
2022-12-03更新
|
211次组卷
|
7卷引用:河南省三门峡市渑池县2020-2021学年九年级上学期期末数学试题
河南省三门峡市渑池县2020-2021学年九年级上学期期末数学试题2021年陕西省西安市灞桥区中考数学模拟试卷(已下线)【万唯】2020年陕西省初中学业水平考试数学2021年安徽省蚌埠市第六中学九年级第一次质检试卷数学试题(一模)2021年广西百色市靖西市初中学业水平适应性模拟测试数学试题(二)2020年陕西省中考数学试卷(副卷)(已下线)专题3.55 圆中的相似问题(巩固篇)(专项练习)-2022-2023学年九年级数学下册基础知识专项讲练(北师大版)
8 . 已知:如图,在
中,
,
于D,E为直角边
的中点,过D,E作直线交
的延长线于F.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.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/a874faa10cf533045a4311483dda9a1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/31f43f2b-d971-4880-8e7a-c6f716e1eeee.png?resizew=174)
您最近一年使用:0次
2022-11-30更新
|
767次组卷
|
7卷引用:山东省济宁市鱼台县2020-2021学年九年级上学期期末数学试题
山东省济宁市鱼台县2020-2021学年九年级上学期期末数学试题第四章 B拓展区 综合拓展北师大版九年级上册九年级上册 第四章 专题 3 相似三角形中的“基本图形”[重点]沪科版九年级数学上册22.3相似三角形的性质人教版九年级下第二十七章 相似 B拓展区 综合拓展安徽省涡阳县曹市中学2022-2023学年九年级上学期期中数学试卷(已下线)专题22 相似三角形-备战2023年中考数学一轮复习之必考点题型全归纳与分层精练(全国通用)
解题方法
9 . 将2023个边长为1的正方形按如图所示的方式排列,点
,
,
,
,……
和点
,
,
,……,
是正方形的顶点,连接
,
,
,……
分别交正方形的边
,
,
,……
于点
,
,
……
,四边形
的面积是
,四边形
的面积是
,…,则
为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb23814c40a4929a6483d60a413968da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b104090ea2ac34be58a76a4e0e95cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df1d9b712b639c8b6809c9f3ae03706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a322c90cd9169ecde9415114fb7c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f04317579e1fc1a24bf3c34d58ffb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ab97a91de22e534d60a23ba8c2a7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6b1e7fba1ea59b04ac5b352bfcacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf8162519276f9f5ef285b3ccf2016f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9148f0960dfa80046ea3c1535689782a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52cd130ab07c1370459047db5f37be5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8faacc27e2cde01d6a98c422708ab6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7688363f5ffff23a6193c7a8eee501c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5815cc29f60d2aa538c4dd30e0803a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71d1bd9858f86566b43bf41413563416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dd517ed56998a3804922c18db27ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35adaef5fc55439d626f1880614d9b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6af123087a1bd54f400298a00aac5ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166a40365a42b31a364defa68c4597b1.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
10 . 如图,在
中,
是角平分线,
平分
交
于点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/334f2e54-c730-4f29-86a5-fab8e0f1c7e8.png?resizew=139)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/334f2e54-c730-4f29-86a5-fab8e0f1c7e8.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f65b265b59b8a83e14de2d5d172763.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d579705ff858c2f0e835122a79455a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
2022-11-21更新
|
64次组卷
|
4卷引用:浙江省温州市瑞安市2020-2021学年九年级上学期期末数学试题