已知,AB是⊙O的直径,点P在弧AB上(不含点A、B),把△AOP沿OP对折,点A的对应点C恰好落在⊙O上.
(1)当P、C都在AB上方时(如图1),判断PO与BC的位置关系(只回答结果);
(2)当P在AB上方而C在AB下方时(如图2),(1)中结论还成立吗?证明你的结论;
(3)当P、C都在AB上方时(如图3),过C点作CD⊥直线AP于D,且CD是⊙O的切线,证明:AB=4PD.
(1)当P、C都在AB上方时(如图1),判断PO与BC的位置关系(只回答结果);
(2)当P在AB上方而C在AB下方时(如图2),(1)中结论还成立吗?证明你的结论;
(3)当P、C都在AB上方时(如图3),过C点作CD⊥直线AP于D,且CD是⊙O的切线,证明:AB=4PD.
![](https://img.xkw.com/dksih/QBM/2012/7/26/1573469796106240/1573469827375104/STEM/bc6428adc8e54e42906d80f64076a55a.png?resizew=550)
2012·广东珠海·中考真题 查看更多[9]
(已下线)2012年初中毕业升学考试(广东珠海卷)数学2015届广东省东莞市南开实验学校九年级上学期期中考试数学试卷2017届江苏扬州宝应县九年级上9月考数学试卷2016-2017学年江苏南师大二附中九年级上10月考数学试卷2016-2017学年安徽阜阳十一中九年级上期中数学卷2017年秋(北师大版)九年级数学下册(河南)检测:河南热点专题(七) 切线的性质与判定2018年秋人教版数学九年级(上)第24章 圆 解答题培优试题(已下线)惠州卷06-【赢在中考·黄金8卷】备战2023年中考数学全真模拟卷(广东惠州专用)江苏省盐城市亭湖区明达初级中学2022-2023学年九年级上学期12月月考数学试题
更新时间:2019-01-30 18:14:09
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解答题-证明题
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【推荐1】如图,△ ABC和△ CDE都是等边三角形,B、C、D三点在一条直线上,AD与BE相交于点P,AC与BE相交于点M,AD、CE相交于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/34ea250c-fb0e-44f0-914d-0f79e234f072.png?resizew=234)
(1)求证:△ACD≌△BCE;
(2)求∠APM的度数;
(3)连接MN,求证:△ CMN是等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/12/34ea250c-fb0e-44f0-914d-0f79e234f072.png?resizew=234)
(1)求证:△ACD≌△BCE;
(2)求∠APM的度数;
(3)连接MN,求证:△ CMN是等边三角形.
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【推荐2】已知在
中,
,
为
中点,
为
边的中线且
,连接
、
.
;
(2)若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5ca9eaac31b0fc91c38d29ebdfc73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5181b97a7e43959b8455680157c3b644.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
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【推荐3】在一次数学探究活动中,王老师设计了一份活动单:已知线段BC=2,使用作图工具作∠BAC=30°,尝试操作后思考:
(1)这样的点A唯一吗?
(2)点A的位置有什么特征?你有什么感悟?
“追梦”学习小组通过操作、观察、讨论后汇报:点A的位置不唯一,它在以BC为弦的圆弧上(点B、C除外),….小华同学画出了符合要求的一条圆弧(如图1).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/7eda6a3f-1b06-401f-937d-df88a8f32924.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/f80b6de2-f801-4713-99b2-9cda9d19e100.png?resizew=157)
(1)小华同学提出了下列问题,请你帮助解决.①该弧所在圆的半径长为 ;②△ABC面积的最大值为 ;
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为A′,请你利用图1证明∠BA′C>30°.
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,在平面直角坐标系的第一象限内有一点B,坐标为(2,m),过点B作AB⊥y轴,BC⊥x轴,垂足分别为A、C,若点P在线段AB上滑动(点P可以与点A、B重合),发现使得∠OPC=45°的位置有两个,则m的取值范围为 .
(1)这样的点A唯一吗?
(2)点A的位置有什么特征?你有什么感悟?
“追梦”学习小组通过操作、观察、讨论后汇报:点A的位置不唯一,它在以BC为弦的圆弧上(点B、C除外),….小华同学画出了符合要求的一条圆弧(如图1).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/7eda6a3f-1b06-401f-937d-df88a8f32924.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/22/f80b6de2-f801-4713-99b2-9cda9d19e100.png?resizew=157)
(1)小华同学提出了下列问题,请你帮助解决.①该弧所在圆的半径长为 ;②△ABC面积的最大值为 ;
(2)经过比对发现,小明同学所画的角的顶点不在小华所画的圆弧上,而在如图1所示的弓形内部,我们记为A′,请你利用图1证明∠BA′C>30°.
(3)请你运用所学知识,结合以上活动经验,解决问题:如图2,在平面直角坐标系的第一象限内有一点B,坐标为(2,m),过点B作AB⊥y轴,BC⊥x轴,垂足分别为A、C,若点P在线段AB上滑动(点P可以与点A、B重合),发现使得∠OPC=45°的位置有两个,则m的取值范围为 .
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解答题-证明题
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适中
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【推荐1】如图,已知
是
的直径,点
,
在
上,连接
,
和
.过点
作
交
于点
,
与
相交于点
,
为
延长线上一点,
是
的切线.
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492428016246784/2493752676188160/STEM/cac47c07-e1a6-4b3e-a99c-b7080c1fe545.png?resizew=194)
(1)求证:
:
(2)若点
是
中点,
,
,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/8455657dde27aabe6adb7b188e031c11.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ed88dfb3067fe12ba06686ded2faed9.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](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/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492428016246784/2493752676188160/STEM/cac47c07-e1a6-4b3e-a99c-b7080c1fe545.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656efb97ccd0c39dce9e8e894663fc4b.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4acbb3cbfb4af84b32615222e09a8166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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解答题-证明题
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【推荐2】如图,
是
的外接圆,
是
的直径,点
在
上,
,连接
,延长
交过点
的切线于点
.
![](https://img.xkw.com/dksih/QBM/2023/4/27/3225490473181184/3225770954244096/STEM/a1064426e3aa4833b88d3a1285ee22d9.png?resizew=161)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212bfbd5575772ca36d6fc3e7b246e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2023/4/27/3225490473181184/3225770954244096/STEM/a1064426e3aa4833b88d3a1285ee22d9.png?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d61f97529ed6945c4fa6219867189a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
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解答题-问答题
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名校
【推荐1】如图,已知半径为2的
与直线l相切于点A,点P是直径
左侧半圆上的动点,过点P作
,垂足为点C,
与
交于点D,连接
,设
的长为式
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/e8b14136-2604-4c1a-83ef-1340b765c68d.png?resizew=167)
(1)当
时,求弦
的长度;
(2)用含有x的代数式表示
,并求出当x为何值
的值最大?最大值是多少?.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a67cf9efc28969ec51368b8f0abe104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae635497d0343ac78f2dd4d17236215.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/e8b14136-2604-4c1a-83ef-1340b765c68d.png?resizew=167)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55aa0a20848c37c1892c567b2315e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
(2)用含有x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b693476ca8304b3fce1b8a1e09b92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6b693476ca8304b3fce1b8a1e09b92d.png)
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解答题-证明题
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【推荐2】如图,
为
的直径,点
、
在
上,连接
、
、
、
,
交
于点
,过点
作
的切线
,交
的延长线于点
,若
.
(1)求证:
;
(2)若
的半径为
,
,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/2a30f3a8b673cc28bd90c50cf1a35281.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/2/9bebb0c6-5d2c-436e-8f46-8a135db64a3d.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833aeeec99309afd458ba2b651c19b53.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f00c1fd910e09308d0928af160515b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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