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過點E作OE⊥AC於點E,∵∠AOB=90°,AO=5,OB=12,∴AB=13,∴EO×AB=AO×BO,∴EO=AO×BOAB=5×1213=6013,在Rt△AEO中AE=AO2−EO2=2513,∴AC=2513×2=5013,∴BC=13-5013=11913.
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