如图1,在四边形
中,
,
,
是
的直径,
平分
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/53e95a98-b4e3-4f8e-88c8-a113d91912a4.png?resizew=200)
(1)求证:直线
与
相切;
(2)如图2,记(1)中的切点为
,
为优弧
上一点,
,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.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/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/53e95a98-b4e3-4f8e-88c8-a113d91912a4.png?resizew=200)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如图2,记(1)中的切点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f986c181183d8e7e45655e6c5b5d5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c21905a8c93b6621e9914d773b3418.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/edd44df8-d93a-4320-8eeb-f02076a2aea7.png?resizew=200)
2020·广东·中考真题 查看更多[9]
广东省2020年中考数学试题2021年山东省聊城市高唐县中考一模数学试题(已下线)专题14 圆(二)-备战2022年中考数学母题题源解密(广东专用)2022学年山东省德州市临邑县九年级下学期第二次练兵考试数学试题2022年山东省德州市临邑县中考二模数学试题(已下线)第2章 直线与圆的位置关系(A卷·知识通关练)-【单元测试】2022-2023学年九年级数学下册分层训练AB卷(浙教版)2020年广东省云浮市中考一模数学试卷2021年广东省东莞市茶山镇中考一模数学试题(已下线)清单06 证明圆切线的七种方法 (7种题型解读(25题))-2023-2024学年九年级数学上学期期末考点大串讲(苏科版)
更新时间:2020-07-22 16:26:41
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【推荐1】射线QN与等边
ABC的两边AB,BC分别交于点M,N,且AC∥QN,AM=MB=2cm,QM=4cm.动点P从点Q出发,沿射线QN以每秒1cm的速度向右移动,经过t秒,以点P为圆心,
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【推荐2】如图,A为⊙O外一点,AO⊥BC,直径BC=12,AO=10,
的长为π,点P是BC上一动点,∠DPM=90°,点M在⊙O上,且∠DPM在DP的下方.
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938482149613568/2942378430046208/STEM/2d8ee50b-2d75-459a-9203-c13e155332fe.png?resizew=437)
(1)当sinA=
时,求证:AM是⊙O的切线;
(2)求AM的最大长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
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(1)当sinA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
(2)求AM的最大长度.
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【推荐1】对于平面直角坐标系xOy中的图形M,N,给出如下定义:若图形M和图形N有且只有一个公共点P,则称点P是图形M和图形N的“关联点”.
已知点
,
,
,
.
(1)直线l经过点A,
的半径为2,在点A,C,D中,直线l和
的“关联点”是______;
(2)G为线段OA中点,Q为线段DG上一点(不与点D,G重合),若
和
有“关联点”,求
半径r的取值范围;
(3)
的圆心为点
,半径为t,直线m过点A且不与x轴重合.若
和直线m的“关联点”在直线
上,请直接写出b的取值范围.
已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448c0a5ee776d19ce8e42ac9a5fd27c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29610a3415c1e795d35979a5a9ff69f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f63f0bdeade1904c747ec9ef0ff3443.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1c58d155a52d63a2fceab387bddc9a.png)
(1)直线l经过点A,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
(2)G为线段OA中点,Q为线段DG上一点(不与点D,G重合),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7bd8bfbd43d0cf1604b8d7e0023f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456dc9e5dbcc3ffe05c82e1cfe0c1804.png)
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【推荐2】在矩形ABCD中,AB=8cm,BC=6cm,点P从点A出发,沿AB边向点B以每秒2cm的速度移动,同时点Q从点D出发沿DA边向点A以每秒1cm的速度移动,P、Q其中一点到达终点时,另一点随之停止运动.设运动时间为t秒.回答下列问题:
(1)如图①,几秒后△APQ的面积等于5cm2.
(2)如图②,若以点P为圆心,PQ为半径作⊙P.在运动过程中,是否存在t值,使得点C落在⊙P上?若存在,求出t的值;若不存在,请说明理由.
(3)如图③,若以Q为圆心,DQ为半径作⊙Q,当⊙Q与AC相切时
①求t的值.
②如图④,若点E是此时⊙Q上一动点,F是BE的中点,请直接写出CF的最小值.
(1)如图①,几秒后△APQ的面积等于5cm2.
(2)如图②,若以点P为圆心,PQ为半径作⊙P.在运动过程中,是否存在t值,使得点C落在⊙P上?若存在,求出t的值;若不存在,请说明理由.
(3)如图③,若以Q为圆心,DQ为半径作⊙Q,当⊙Q与AC相切时
①求t的值.
②如图④,若点E是此时⊙Q上一动点,F是BE的中点,请直接写出CF的最小值.
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【推荐1】如图,在直角坐标系中,半径为1的⊙A圆心与原点O重合,直线l分别交x轴、y轴于点B、C,点B的坐标为(6,0),∠ABC=60°.
(1)若点P是⊙A上的动点,则P到直线BC的最小距离是 .
(2)若点A从原点O出发,以1个单位/秒的速度沿着线路OB→BC→CO运动,回到点O停止运动,⊙A随着点A的运动而移动.设点A运动的时间为t.
①求⊙A在整个运动过程中与坐标轴相切时t的取值;
②求⊙A在整个运动过程中所扫过的图形的面积.
(1)若点P是⊙A上的动点,则P到直线BC的最小距离是 .
(2)若点A从原点O出发,以1个单位/秒的速度沿着线路OB→BC→CO运动,回到点O停止运动,⊙A随着点A的运动而移动.设点A运动的时间为t.
①求⊙A在整个运动过程中与坐标轴相切时t的取值;
②求⊙A在整个运动过程中所扫过的图形的面积.
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168960496803840/2176587030601728/STEM/3eca49044aa54cfdab21eb486cf41928.png?resizew=201)
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解题方法
【推荐2】(1)观察猜想:如图①,在
和
中,
,
,
,连接
,点
是
的中点,连接
、
,当点
、
、
三点共线时,线段
与线段
的数量关系是_________,位置关系是_________.
(2)探究证明:在(1)的条件下,将
绕点
顺时针旋转至图②位置时,(1)中的结论是否仍然成立?如果成立,请你就图②的情形进行证明;如果不成立,请说明理由.
(3)拓展延伸:如图③,在
和
中,
,
,
,连接
,点
是
的中点,连结
、
,将
绕点
在平面内自由旋转,请直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
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(2)探究证明:在(1)的条件下,将
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)拓展延伸:如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eddf629bfb2d7b9daea6f2c1553360af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47d2d1ca5d4ea1c6cd1a0645fd1a30.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb9ec57d28a9d3aed7f8e67d98bbb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/004b8035-f7d3-442c-8a9d-b23141e9b334.png?resizew=505)
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【推荐1】【问题提出】
(1)如图1,在
中,
,
,
,点D是
的中点,点E在
上,且
,点F是
边上的一个动点,连接
、
,求
的最小值;
【问题解决】
(2)如图2,四边形
是某市的一块绿地公园,已知该绿地公园的两个入口G、H分别在
、
边上,
,
,
,
,
,
,现计划在边
上修建一个半径为
的圆形休闲娱乐广场(即
的圆心在
上,且
的半径为
),再沿直径
设置一排休息长椅(宽度忽略不计,且
),在F处设置自助饮水设备,需要沿
和
铺设地下水管,从节约成本的角度考虑,铺设地下水管的长度
要最小,请你求出
的最小值.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2816811954311a2792b3bfaa7aecf81f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2dfdd2bd7a008edaa0cd92b599231f1.png)
【问题解决】
(2)如图2,四边形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fec9e3bf7ff287df2cbdff8addfaf5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041cb52f2491fc4d3cb32063d0e116b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46ca123fee45df4fb78a6c0a1872136.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd768b85544cda3d1cb8a90c5f37c32.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903dd71f3338be73e6669560c55bf470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c1b0e95822515cdecb76195062385a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33c1b0e95822515cdecb76195062385a.png)
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【推荐2】如图,
是
的直径,C,D都是
上的点,
平分
,过点D作
的垂线交
的延长线于点E,交
的延长线于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/b5a4cfad-0558-4f87-98af-0820cd27aba2.png?resizew=263)
(1)求证:
是
的切线;
(2)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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/b5a4cfad-0558-4f87-98af-0820cd27aba2.png?resizew=263)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24863a52a4148b7f0bbc7732b9235cd.png)
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【推荐3】如图1,线段AB,CD交于点O,连接AC和BD,若∠A与∠B,∠C与∠D中有一组内错角成两倍关系,则称
与
为倍优三角形,其中成两倍关系的内错角中,较大的角称为倍优角.
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986405636136960/2989260695470080/STEM/70a399cd-b4ff-43a6-ad61-9d209c778e9b.png?resizew=739)
(1)如图2,在四边形ABCD中,对角线AC,BD交于点O,已知
,
为等边三角形.求证:
,
为倍优三角形.
(2)如图3,已知边长为2的正方形ABCD,点P为边CD上一动点(不与点C,D重合),连接AP和BP,对角线AC和BP交于点O,当
和
为倍优三角形时,求:∠DAP的正切值.
(3)如图4,四边形ABCD内接于
,
和
是倍优三角形,且∠ADP为倍优角,延长AD,BC交于点E.若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
![](https://img.xkw.com/dksih/QBM/2022/5/24/2986405636136960/2989260695470080/STEM/70a399cd-b4ff-43a6-ad61-9d209c778e9b.png?resizew=739)
(1)如图2,在四边形ABCD中,对角线AC,BD交于点O,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915e8e775538d41debf1933102c6b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
(2)如图3,已知边长为2的正方形ABCD,点P为边CD上一动点(不与点C,D重合),连接AP和BP,对角线AC和BP交于点O,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b4dcc093218443f71a046b6df94bbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
(3)如图4,四边形ABCD内接于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b515965c22d2950b592c096c6e3bdfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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