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九年级数学：怎么证明AB是圆的切线？怎么求圆的半径？求正切值？
九年级数学：怎么证明AB是圆的切线？怎么求圆的半径？求正切值？
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形164/233
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