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菱形包含正方形,即正方形是特殊的菱形,是菱形的一種.求證滿足以下就可以推出了: 1、一組鄰邊相等的平行四邊形是菱形; 2、四邊相等的四邊形是菱形; 3、對角線互相垂直的平行四邊形是菱形; 4、對角線互相垂直平分的四邊形是菱形. good luck!
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