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(2001•安徽)如图,AB是⊙O的直径,l1,l2是⊙O的两条切线,且l1∥A...
(2001•安徽)如图,AB是⊙O的直径,l
1,l
2是⊙O的两条切线,且l
1∥AB∥l
2,若P是PA、PB上一点,直线PA、PB交l
2于点C、D,设⊙O的面积为S
1,△PCD的面积为S
2,则
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=( )
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A.π
B.
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C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232637990848658/SYS201310212326379908486017_ST/3.png)
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