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過點O作OM⊥AB於M,ON⊥CD於N∵OM⊥AB∴AM=AB/2=3∴OM=√(OA²;-AM²;)=√(25-9)=4∵ON⊥CD∴CN=CD/2=4∴ON=√(OC²;-CN²;)=√(25-16)=3∵AB//CD∴AB、CD間的距離當AB、CD在O的兩側時…
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