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nga0812
2 năm trước
Cho hình vuông ABCD có cạnh bằng a . Gọi O là giao điểm của đường chéo AC và BD . Trên đoạn thẳng AB và OC lần lượt lấy các điểm E và F sao cho AE =OF×căn2. A. Chứng minh tam giác DEF vuông cân. B. Giả sử AE= 2EB . Tính diện tích của tam giác DEF theo a .
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