1 .
在⊙O外,
切⊙O于
,
交⊙O于
、
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 如图,
是半圆
的直径,点
在半圆上,
于点
,且
,设
,则
=
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/03e3d6328b1e487da128159725b54332.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/8be9c76e39ac4191a5ac12207591942f.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/7b5bcfe4233048599314efc68e800143.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/399d39e241554abcb36f3e1b83ee1017.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971cd0358b49f1661adc674801bd6ecb.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/76860b20b46948f3b19fee3ab7593a01.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/be253aabab5149a7982631cecb2dc338.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0784827daa1e4dbadb6c3c0c7e6c73c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45b33a8e9a0071cef5414525c6fe45ef.png)
![](https://img.xkw.com/dksih/QBM/2011/7/16/1570262382518272/1570262387662848/STEM/03e3d6328b1e487da128159725b54332.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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10-11高二下·陕西·期中
3 . 如图4所示,圆O的直径AB=6,C为圆周上一点,BC=3过C作圆的切线l,过A作l的垂线AD,垂足为D,则∠DAC =
![](https://img.xkw.com/dksih/QBM/2011/5/13/1570196850991104/1570196856258560/STEM/eb8e0801d81048618f83ecf5b47b49e5.png)
![](https://img.xkw.com/dksih/QBM/2011/5/13/1570196850991104/1570196856258560/STEM/eb8e0801d81048618f83ecf5b47b49e5.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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13-14高一·全国·课后作业
4 . 在直径为4的圆内接矩形中,最大的面积是( )
A.4 | B.2 | C.6 | D.8 |
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13-14高二·全国·课后作业
5 . 如图所示,已知⊙O的半径为5,两弦AB、CD相交于AB的中点E,且AB=8,CE∶ED=4∶9,则圆心到弦CD的距离为
![](https://img.xkw.com/dksih/QBM/2014/3/25/1571575004364800/1571575009558528/STEM/4227f57634a04273b68fcbb7a0d43dfa.png)
![](https://img.xkw.com/dksih/QBM/2014/3/25/1571575004364800/1571575009558528/STEM/4227f57634a04273b68fcbb7a0d43dfa.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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13-14高二·全国·课后作业
6 . 如图所示,P、Q分别在BC和AC上,BP∶CP=2∶5,CQ∶QA=3∶4,则
( ).
![](https://img.xkw.com/dksih/QBM/2014/8/6/1571833331859456/1571833337487360/STEM/0980595d6a6f4378a0e0dcc854488ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c3aea74102ef08bdd93016c249b7b0.png)
![](https://img.xkw.com/dksih/QBM/2014/8/6/1571833331859456/1571833337487360/STEM/0980595d6a6f4378a0e0dcc854488ed3.png)
A.3∶14 | B.14∶3 | C.17∶3 | D.17∶14 |
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10-11高二下·吉林·开学考试
7 . 下列判断正确的是( )
A.两个直角三角形相似 | B.两个相似三角形一定全等 |
C.凡等边三角形都相似 | D.所有等腰三角形都相似 |
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10-11高二下·吉林·开学考试
8 . 如图,E是⊙O内接四边形 ABCD两条对角线的交点,CD延长线与过 A点的⊙O的切线交于F点,若∠ABD=440,∠AED=1000,
, 则∠AFC的度数为( )
![](https://img.xkw.com/dksih/QBM/2011/4/22/1570125670285312/1570125675339776/STEM/970e32249e9a4deca1df7611328ef0ef.png?resizew=139)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20b57ab134b3d3dbe9b1d35ad762384.png)
![](https://img.xkw.com/dksih/QBM/2011/4/22/1570125670285312/1570125675339776/STEM/970e32249e9a4deca1df7611328ef0ef.png?resizew=139)
A.780 | B.920 | C.560 | D.1450 |
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10-11高二下·海南·期末
9 . 如图,AB是半圆O的直径,C、D是半圆上两点,半圆O的切线PC交AB的延长线于点P,∠PCB=25°,则∠ADC=( )
![](https://img.xkw.com/dksih/QBM/2011/4/18/1570122042114048/1570122047152128/STEM/58578d0fd4bb40e2b41f69955ebb84cf.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2011/4/18/1570122042114048/1570122047152128/STEM/58578d0fd4bb40e2b41f69955ebb84cf.png?resizew=158)
A.105° | B.115° | C.120° | D.125° |
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