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如图,⊙O是△ABC的外接圆,AB=AC,过点A作AP∥BC,交BO的延长线于点P.(1)求证:AP是⊙O的切线;(2)若⊙O的半径R=5,BC=8,求线段AP的长.
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教案备课库《初三数学作业010B切线的判定》真题及答案
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