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oggyfaker
2 năm trước
Cho tam giác ABC vuông tại A, đường cao AH. D và E lần lượt là chân đường vuông góc hạ từ H xuống AB và AC. Gọi M, N lần lượt là trung điểm của BH, HC. a) Chứng minh DMNE là hình thang vuông b)Cho BH = 4cm; HC = 9cm; AH = 6cm. Tính diện tích hình thang DMNE
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