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2 năm trước
Cho hình chữ nhật ABCD có AB =8cm, CD=12cm E là trung điểm của BC a) Chứng minh tam giác ABE=tam giác DCE b) Chứng minh tam giác ADE ko vuông c) Tia DE cắt tia AB tại F tính độ dài AF d) Từ D kẻ DH vuông góc với AE (H nằm trên đoạn thẳng AE ) tính độ dài AH
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