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anhluuthinhuanh213
2 năm trước
Cho tứ giác ABCD. Gọi M,N,P,Q lần lượt là trung điểm của AB, BC, CD, DA a) tứ giác MNPQ là hình gì, vì sao? b)Tìm điều kiện của tứ giác ABCD để tứ giác MNPQ là hình vuông. c) Với điều kiện câu b) hãy tính tỉ số diện tích của tứ giác ABCD và MNPQ.
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