1 . 如图,点O是Rt△ABC的AB边上一点,∠ACB=90°,⊙O与AC相切于点D,与边AB,BC分别相交于点E,F,
(1)求证:DE=DF;
(2)当BC=3,sinA=
时,求AE的长.
(1)求证:DE=DF;
(2)当BC=3,sinA=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229589640749056/2231191612522496/STEM/f16a43f5d70b46e381a7749572c47547.png?resizew=188)
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2019-02-09更新
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3卷引用:北师大版九年级下册 第三章 圆 单元测试卷
2 . 如图,
、
是
的切线,切点分别为
、
.
的延长线与
的直径
的延长线交于
点,连接
,
.
探索
与
的位置关系,并加以证明;
若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6bb8609702e37f91fdd598cccbc2c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc2730277cbe81789d071e235bc9315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c14c6709d2a04863cacdee618b20613e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7909220d1db380634534190b662ee0a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc2730277cbe81789d071e235bc9315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f74a2f61d78627296fac510313d219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c2bb7be2e9410a16502268fd4c67be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93817f9341592f0626b02c78b65ccdf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e15fb05fa43139f0305756f5ea130e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93817f9341592f0626b02c78b65ccdf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e15fb05fa43139f0305756f5ea130e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f087a24932fd847ad06689695a7296a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1071e7c88ca5002988ee77ee6452695a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3351c5ed0b248bb1ffb8bd6e6724475a.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084770011111424/2136805285052416/STEM/3b9fc31bc2da4714b37d8a34d78868f3.png?resizew=143)
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3 . 如图,已知AB是⊙O的直径,点P在BA的延长线上,PD与⊙O相切于点D,过点B作PD的垂线交PD的延长线于点C.若⊙O的半径为4,BC=6,求PA的长.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084649991192576/2136718599716864/STEM/27ff3903d45343668ab6553351440c7e.png?resizew=105)
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4 . 如图,AB是⊙O的直径,AC与⊙O相切,切点为A,D为⊙O上一点,AD与OC相交于点E,且∠DAB=∠C.求证:OC∥BD.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084649991192576/2136718599725056/STEM/1e56e6f8992b46019f902c0872c01011.png?resizew=88)
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5 . 如图,已知点E在△ABC的边AB上,∠C=90°,以AE为直径的⊙O切BC于点D
(1)求证:AD平分∠BAC;
(2)已知∠B=30°,AD=2
,求图中阴影部分的面积.
(1)求证:AD平分∠BAC;
(2)已知∠B=30°,AD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084649991192576/2136718599725057/STEM/4e374bc1a40449f78628fe920daada41.png?resizew=107)
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2019-02-09更新
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842次组卷
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2卷引用:2019届湘教版数学九年级下册 第二章 圆单元检测试题
6 . 如图,
,
分别与
相切于点
,
,
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071308678504448/2136358174539776/STEM/59fb51381ea2443f850247fbf68698c2.png?resizew=118)
(1)
所对的圆心角
________度;
若
,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.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/e6b545ad6a6a318ae64e3571b773ae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e37b122a7273e1251ea3860e74c896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071308678504448/2136358174539776/STEM/59fb51381ea2443f850247fbf68698c2.png?resizew=118)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27b84a955925cdf8b13eb5f68e563af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6849bee5bcd87fc116ef9d630733eeec.png)
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7 . 如图,
是
的直径,
,
是
的切线,
,
是切点,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071308678504448/2136358174367744/STEM/1f2a92b093cd45e4a30ea39c316f410e.png?resizew=123)
求证:
;
若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2018/11/8/2071308678504448/2136358174367744/STEM/1f2a92b093cd45e4a30ea39c316f410e.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05952aed2d0c47964df23452178899d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7b6aea86a32cd3023aa4eb05dbb1d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0440c4882bc4e4d457dbd5b9bd164439.png)
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8 . 如图,AB为⊙O的直径,过点C的切线DE交AB的延长线于点D,AE⊥DC,垂足为E.求证:AC平分∠BAE.
![](https://img.xkw.com/dksih/QBM/2019/1/27/2127798763012096/2130010710728704/STEM/855d4bc52bd14390bc1b3fb87c6215db.png?resizew=176)
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2019-01-30更新
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3卷引用:2019年春人教版九年级上册数学《第24章 圆》单元测试题
2019年春人教版九年级上册数学《第24章 圆》单元测试题(已下线)第24章 圆 单元检测(1)-2020-2021学年九年级数学上册《十分钟同步课堂专练》(人教版)江苏省淮安市洪泽区2018-2019学年九年级上学期期中数学试题
10-11九年级下·全国·期末
真题
名校
9 . 如图,已知AB是⊙O的直径,直线CD与⊙O相切于点C,AC平分∠DAB.
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573517436600320/1573517466238976/STEM/ca02cd5ae5f64b2ba0ce38076093bfc9.png)
(1)求证:AD⊥DC;
(2)若AD=2,AC=
,求AB的长.
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573517436600320/1573517466238976/STEM/ca02cd5ae5f64b2ba0ce38076093bfc9.png)
(1)求证:AD⊥DC;
(2)若AD=2,AC=
![](https://img.xkw.com/dksih/QBM/2012/9/13/1573517436600320/1573517466238976/STEM/136566a2275e4707977fbef658401eda.png)
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19卷引用:2011-2012学年九年级第二学期期末考试数学卷
(已下线)2011-2012学年九年级第二学期期末考试数学卷(已下线)2011-2012学年九年级第二学期期末考试数学卷(已下线)2011-2012学年山东省东营市胜利油田九年级上学期期末考试数学卷(已下线)2012届江苏无锡市锡山区中考一模数学试卷(已下线)2012届陕西西安中等音乐学校九年级下学期期末数学试卷(A)(已下线)2006年初中毕业升学考试(江苏南通卷)数学2013届江苏省无锡市新区九年级上学期期末考试数学试卷2013届江苏省阜宁县东沟中学九年级3月月考数学试卷2015届江苏如皋市港城实验学校九年级上学期期中调研数学试卷 2015届浙江省台州市黄岩区中考第一次模拟考试数学试卷2016届江苏省无锡市璜塘、峭岐九年级上学期12月联考数学试卷2016届浙江省绍兴市浣江教育集团九年级下学期3月检测数学试卷江苏省东台市实验中学2018届九年级10月月考数学试题2017年辽宁省鞍山二十中中考数学模拟试卷浙教版九年级数学下第二章 直线与圆的位置关系 2.1 直线与圆的位置关系 切线的性质 同步练习 江苏省南京市中华中学上新河初中2018-2019学年九年级(上)月考数学试卷(10月份)江苏省无锡市惠山区石塘湾中学2019-2020学年九年级上学期期中数学试题江苏省南通市崇川区八一中学2020-2021学年九年级上学期12月月考数学试题山东省济南市山东师范大学第二附属中学2022年九年级下学期4月月考数学试题
真题
10 . 如图,在△ABC中,∠ACB=90°,E为BC上一点,以CE为直径作⊙O,AB与⊙O相切于点D,连接CD,若BE=OE=2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/b5e32508-8759-4739-a2c5-f0a8018d51c0.png?resizew=215)
(1)求证:∠A=2∠DCB;
(2)求图中阴影部分的面积(结果保留π和根号).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/12/b5e32508-8759-4739-a2c5-f0a8018d51c0.png?resizew=215)
(1)求证:∠A=2∠DCB;
(2)求图中阴影部分的面积(结果保留π和根号).
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2019-01-30更新
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11卷引用:北师大版九年级数学下册单元测试:第三章 圆