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anna.pham.195
2 năm trước
Cho tam giác ΔABC vuông tại A, đường cao AH. Đường phân giác của góc ABC cắt AC tại D và cắt AH tại E. a. Chứng minh: ΔABC đồng dạng ΔHBA và AB2=BC.BH b. Biết AB = 9cm, BC = 15cm. Tính DC c. kẻ AI vuông góc vói BD Chứng minh : ˆBIH=ˆACB
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