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【简答题】
（几何证明选讲选做题）如右图，P是 ⊙O 外一点，PD为⊙ O 的切线，D为切点，割线PEF经过圆心O，若PF=12，PD= ，则∠EFD为____ _度（3分），线段FD的长为___ ___（2分）。
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