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2 năm trước
Cho tam giác ABC vuông tại A có AB= 6cm, AC=8cm. a) Tính độ dài BC b) Kẻ BD là tia phân giác của góc ABC ( D ∈ AC), DH vuông góc với BC ( H ∈ BC). Chứng minh DA=DH c) Chứng minh AD < DC d) Trên tia đối của tia AB lấy điểm M sao cho AM=CH. Chứng minh ba điểm D,M,H thẳng hàng
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