1 . (几何证明选讲选做题)如图,点
都在圆O上,过点C的切线交AB的延长线于点D,若
,
,
,则线段AC的长为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021623480320/1572021629394944/STEM/f7a5bb9ba4ec41bdb7890511914e1f37.png?resizew=142)
您最近一年使用:0次
2 . 如图,已知⊙O的割线PAB交⊙O于A,B两点,割线PCD经过圆心,若PA=3,AB=4,PO=5,则⊙O的半径为______________ .
![](https://img.xkw.com/dksih/QBM/2011/7/26/1570273735401472/1570273740726272/STEM/5abf0315-f664-40fa-b482-652c703f5e02.png)
您最近一年使用:0次
2010·广东汕头·一模
3 . 如图,圆O的割线PBA过圆心O,弦CD交PA于点F,且△COF∽△PDF,PB ="OA"=2,则PF= ____________
![](https://img.xkw.com/dksih/QBM/2013/6/13/1571243317706752/1571243323326464/STEM/2efab2c43bc04ebf92fce446f4ca2a46.png?resizew=196)
您最近一年使用:0次
4 . 如图,点
是圆
上的点,且
,则
对应的劣弧长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413d30bdf1cc8370b1cbe3d14c22c93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://img.xkw.com/dksih/QBM/2010/4/4/1569690186776576/1569690191945728/STEM/9d9eeff8-b425-44df-8eb6-b89e5f7a3fcb.png?resizew=148)
您最近一年使用:0次
2011·广东揭阳·一模
5 . 如图,点P在圆O直径AB的延长线上,且PB=OB=2,PC切圆O于C点,CD
AB于D点,则CD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1633988fd62a652de726ee92a917b52d.png)
![](https://img.xkw.com/dksih/QBM/2011/11/7/1577544521203712/1577544521555968/STEM/a3076a8fc48f4c33b33b49361686b992.png?resizew=160)
您最近一年使用:0次
2011·广东广州·一模
6 . 在梯形ABCD中,AD∥BC,AD=2,BC=5,点E、F分别在AB、CD上,且EF∥AD,若
,则EF的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44713ca253b0ed70a51819b05692676e.png)
您最近一年使用:0次
2011·广东广州·高考模拟
7 . 在梯形
中,
,
,
,点
、
分别在
、
上,且
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
的长为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0facf189b2a3153beb7b9e077d3b1146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948709398d7585ff2b99a0291071bc58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b8f3a66ab29707453069ff17a88e75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b95463a97c60db3250cb641bf6523d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
2011·广东·一模
8 . (几何证明选讲选做题)如图4,
为圆
的切线,
为切点,
,圆
的面积为
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d583183429b6b31aa9742eefc67d3181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdd62c479eb1f4907868c723048ca7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9fdc1f8ed0ae44b54a9a2a3aca2db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5745e2dc1d5308872c68ae932cd13ffa.png)
![](https://img.xkw.com/dksih/QBM/2011/4/7/1570110290182144/1570110295465984/STEM/25de639ae1fd40c2aec7b1fc5c490316.png?resizew=143)
您最近一年使用:0次
2011·广东·一模
9 . 如图,已知△ABC内接于圆O,点D在OC的延长线上,AD是⊙0的切线,若∠B=30°,AC=2,则OD的长为____________ .
![](https://img.xkw.com/dksih/QBM/2011/3/17/1570046306656256/1570046311874560/STEM/098a7672859c450b853c42734162705f.png?resizew=105)
您最近一年使用:0次