Mathematics, 11.09.2021 14:40 jetblackcap

Cho tứ giác ABCD. Gọi E, F,G, H lần lượt là trung điểm của các cạnh AB, BC, CD và DC và I, J là trung điểm của 2 đường chéo AC và BD. Chứng minh: các tứ giác EFGH, IFJH là các hình bình hành

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Cho tứ giác ABCD. Gọi E, F,G, H lần lượt là trung điểm của các cạnh AB, BC, CD và DC và I, J là trun...