1 . 如图,点
是
的边
上的一点,
与边
相切于点
,与线段
相交于点
,若点
是
上一点,且
,则
的度数为( )
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084775103660032/2085434287439872/STEM/c229f193e02d4cd3bc26f2fcfdf96aed.png?resizew=110)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b2a8c80bc574fc27cb32dcb06c6679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e240b05580707212ae7ed3871d7e29c3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7909220d1db380634534190b662ee0a7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee0ef65cbd6c843b78d5e27d2b3f426.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e240b05580707212ae7ed3871d7e29c3.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084775103660032/2085434287439872/STEM/c229f193e02d4cd3bc26f2fcfdf96aed.png?resizew=110)
A.20° | B.35° | C.55° | D.70° |
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2016-12-06更新
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2卷引用:华师大版九年级数学下册第27章圆单元测试卷
2 . 如图,AB是⊙O的直径,点C在AB的延长线上,CD切⊙O于点D,连接AD,若∠A=25°,请你求出∠C的度数.
![](https://img.xkw.com/dksih/QBM/2018/12/4/2089607935582208/2090208480165888/STEM/68d279447a4a40f787c80c1e7e5c6255.png?resizew=136)
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3 . 如图,
是
的直径,
是
延长线上一点,
切
于点
,如果
,
,那么线段
的长等于( )
![](https://img.xkw.com/dksih/QBM/2018/12/2/2088295368851456/2089768599052288/STEM/921a56fb-a4fe-4e0c-b617-eccb71903ba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.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/9155d9676e02a971116aacd1165490cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705e444349c3ba4ca695e6b9cc99a11b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://img.xkw.com/dksih/QBM/2018/12/2/2088295368851456/2089768599052288/STEM/921a56fb-a4fe-4e0c-b617-eccb71903ba5.png)
A.3 | B.4 | C.5 | D.6 |
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4 . 如图,AC切⊙O于点B,AB=OB=3,BC=
,求∠AOC的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2018/6/10/1963872322551808/1968072030019585/STEM/294e9216d4194514a2e6e4b89e259eec.png?resizew=83)
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5 . 如图,
是
的直径,
是
的切线,
,
、
交
于
、
,
,
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7a5de06d5577a27967d000e360e851.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e441d9a286d558a6bba0f91138dcb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a078e003093534ab252248dedc2b2aba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52705567101a48893de582656ef41527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e7a5de06d5577a27967d000e360e851.png)
![](https://img.xkw.com/dksih/QBM/2018/12/2/2088295368851456/2089768599117824/STEM/9b577077b52f4443ae6f16ac8ec491fd.png?resizew=225)
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11-12九年级上·河北秦皇岛·期中
6 . 如图①,AB是⊙O的直径,AC是弦,直线EF和⊙O相切于点C,AD⊥EF,垂足为D.
(1)求证:∠DAC=∠BAC;
(2)若把直线EF向上平行移动,如图②,EF交⊙O于G、C两点,若题中的其它条件不变,猜想:此时与∠DAC相等的角是哪一个?并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2011/12/6/1573297077919744/1573297115021312/STEM/2b45b129-2419-49bc-92d1-04b8202c84c9.png?resizew=162)
(1)求证:∠DAC=∠BAC;
(2)若把直线EF向上平行移动,如图②,EF交⊙O于G、C两点,若题中的其它条件不变,猜想:此时与∠DAC相等的角是哪一个?并证明你的结论.
![](https://img.xkw.com/dksih/QBM/2011/12/6/1573297077919744/1573297115021312/STEM/2b45b129-2419-49bc-92d1-04b8202c84c9.png?resizew=162)
![](https://img.xkw.com/dksih/QBM/2011/12/6/1573297077919744/1573297115021312/STEM/6a92e2c3-af0d-4fb4-bed5-01f038148e01.png?resizew=158)
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2016-12-05更新
|
790次组卷
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5卷引用:华东师大版九年级数学下册期末综合检测试卷
华东师大版九年级数学下册期末综合检测试卷(已下线)2011-2012年河北省北戴河区第二中学九年级上学期期中考试数学卷(已下线)2011年北戴河区第二中学九年级上学期期中考试数学卷(已下线)2011-2012学年河北省北戴河区第二中学初三上学期期中考试数学试卷山西省吕梁市兴县2020-2021学年九年级上学期期末数学试题
7 . 如图,AC是⊙O的切线,BC是直径,AB交⊙O于点D,∠A=50°,那么∠COD=________ .
![](https://img.xkw.com/dksih/QBM/2018/12/22/2102480355385344/2104260525891585/STEM/730b762d00544204899af7230fb3107e.png?resizew=118)
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2016-12-06更新
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5卷引用:【期末专题复习】浙教版九年级数学下册 第二章 直线和圆的位置关系 单元检测试卷
11-12九年级上·河南周口·期末
8 . 如图,在Rt△ABC中,∠ACB=90°,以AC为直径的⊙O与AB边交于点D,过点D作⊙O的切线,交BC于点E.
![](https://img.xkw.com/dksih/QBM/2011/12/16/1573308050669568/1573308124839936/STEM/5e45e50bbfa1463f9d9bd24f303b89ec.png?resizew=189)
(1)求证:点E是边BC的中点;
(2)若EC=3,BD=
,求⊙O的直径AC的长度;
(3)若以点O,D,E,C为顶点的四边形是正方形,试判断△ABC的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2011/12/16/1573308050669568/1573308124839936/STEM/5e45e50bbfa1463f9d9bd24f303b89ec.png?resizew=189)
(1)求证:点E是边BC的中点;
(2)若EC=3,BD=
![](https://img.xkw.com/dksih/QBM/2011/12/16/1573308050669568/1573308124839936/STEM/7685e16a02b8448ea698d881a2960cec.png?resizew=29)
(3)若以点O,D,E,C为顶点的四边形是正方形,试判断△ABC的形状,并说明理由.
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9 . 一个边长为4的等边三角形ABC的高与⊙O的直径相等,如图放置,⊙O与BC相切于点C,⊙O与AC相交于点E,则CE的长是:
![](https://img.xkw.com/dksih/QBM/2013/6/4/1573661223395328/1573661229260800/STEM/5d0bd37ce8c0446aabed600e184af927.png)
![](https://img.xkw.com/dksih/QBM/2013/6/4/1573661223395328/1573661229260800/STEM/5d0bd37ce8c0446aabed600e184af927.png)
A.![]() | B.![]() | C.2 | D.3 |
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2卷引用:浙教版九年级数学下册 第二章 直线与圆的位置关系 单元评估检测试题
10 . 如图,线段AB是⊙O的直径,点C、D为⊙O上的点,过点C作⊙O的切线交AB的延长线于点E,若∠E=50°,则∠CDB等于( )
![](https://img.xkw.com/dksih/QBM/2019/1/5/2112153856270336/2113724625338368/STEM/988b75c37bba42ae8d72a575bc5faf13.png?resizew=144)
![](https://img.xkw.com/dksih/QBM/2019/1/5/2112153856270336/2113724625338368/STEM/988b75c37bba42ae8d72a575bc5faf13.png?resizew=144)
A.20° | B.25° | C.30° | D.40° |
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3卷引用:浙教版九年级数学下册第二章直线和圆的位置关系单元检测试卷