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已知:四邊形ABCD是中心對稱圖形,其對稱中心為O,且對角線AC、BD交於O. 求證:ABCD是平行四邊形. 證明:因為AOC共線,而AC關於O對稱,所以AO=CO. 同理,BO=DO. 所以這個四邊形的對角線互相平分,從而它是平行四邊形.
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