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vqusan
2 năm trước
Cho tam giác ABC có BC = 7cm, AC-AB=1cm. Gọi I là giao điểm các tia phân giác của các góc B, C. Kẻ IH vuông góc với BC, ID vuông góc với AB, IE vuông góc với AC. a) Chứng minh tam giác IBD bằng tam giác IBH. Từ đó suy ra ID = IH, BD = BH. b) Tính HB, HC.
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