Cho 2 hình bình hành ABCD và ABEF có chung cạnh AB và nằm trong hai mặt phẳng khác nhau. Biết tam giác ADF đều cạnh 4. Gọi O, O' lần lượt là tâm của hai hình bình hành . Độ dài OO' bằng bao nhiêu???
hình như là 2

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