17-18高二·全国·课后作业
1 . 直线x-y+m=0与圆x2+y2=1相交的一个充分不必要条件是( )
A.0<m<1 | B.-4<m<2 |
C.m<1 | D.-3<m<1 |
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2 . 如图所示,AB=
,BC=2,CD=1,∠ABC=45°,则四边形ABCD的面积为( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830170624/STEM/fd6956734e5342f2ae9929be17ec80d6.png?resizew=102)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830170624/STEM/fd6956734e5342f2ae9929be17ec80d6.png?resizew=102)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 如图所示,AB是⊙O的直径,BC,CD,DA是⊙O的弦,且BC=CD=DA,则∠BCD=( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830137856/STEM/e711075f5ea141e1bf6213c09ea62d22.png?resizew=98)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830137856/STEM/e711075f5ea141e1bf6213c09ea62d22.png?resizew=98)
A.100° | B.110° |
C.120° | D.135° |
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4 . 如图所示,AB,AC为⊙O的切线,B和C是切点,延长OB到D,使BD=OB,连接AD.如果∠DAC=78°,那么∠ADO等于( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830121472/STEM/64ed8ceb4a404a37adda7d5882151db3.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830121472/STEM/64ed8ceb4a404a37adda7d5882151db3.png?resizew=107)
A.70° | B.64° |
C.62° | D.51° |
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5 . 圆内接四边形ABCD中,∠A,∠B,∠C的度数比是2∶3∶6,则∠D=( )
A.67.5° | B.135° |
C.112.5° | D.110° |
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6 . 如图所示,⊙O中弧AB的度数为60°,AC是⊙O的直径,那么∠BOC=( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830072320/STEM/d2cd89a74cd44cce871ac2ef0d36f3bc.png?resizew=92)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830072320/STEM/d2cd89a74cd44cce871ac2ef0d36f3bc.png?resizew=92)
A.150° | B.130° | C.120° | D.60° |
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7 . 如图所示,⊙O是△ABC的外接圆,AD是⊙O的直径,连接CD,若⊙O的半径r=
,AC=2,则cos B的值是( )
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830154240/STEM/c15e7f13ca2b468897843317de4c17b0.png?resizew=84)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
![](https://img.xkw.com/dksih/QBM/2017/8/14/1758200027602944/1817081830154240/STEM/c15e7f13ca2b468897843317de4c17b0.png?resizew=84)
A.![]() | B.![]() |
C.![]() | D.![]() |
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13-14高一·全国·课后作业
8 . 如图所示,AE切⊙D于点E,AC=CD=DB=10,则线段AE的长为
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733338968555520/1734026604756992/STEM/109cc7d366e440f2b0ccdb5b3d4328ab.png?resizew=143)
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733338968555520/1734026604756992/STEM/109cc7d366e440f2b0ccdb5b3d4328ab.png?resizew=143)
A.10 | B.16 | C.10 | D.18 |
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13-14高一·全国·课后作业
9 . 如图,在⊙O中,AB是弦,AC是⊙O的切线,A是切点,过 B作
BD⊥AC于D,BD交⊙O于E点,若AE平分∠BAD,则∠BAD=
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733338968555520/1734026604748800/STEM/8c6859fc979844b9aba9882caf453eff.png?resizew=104)
BD⊥AC于D,BD交⊙O于E点,若AE平分∠BAD,则∠BAD=
![](https://img.xkw.com/dksih/QBM/2017/7/19/1733338968555520/1734026604748800/STEM/8c6859fc979844b9aba9882caf453eff.png?resizew=104)
A.30° | B.45° | C.50° | D.60° |
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