Cho tứ giác ABCD. Gọi M, N, P, Q theo thứ tự là trung điểm của các cạnh AB, BC, CD, DA. Gọi E là điểm bất kì nằm ngoài tứ giác, F là điểm đối xứng với E qua M, G là điểm đối xứng với F qua Q, H là điểm đối xứng với G qua P. Chứng minh rằng E là điểm đối xứng với H qua điểm N.

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