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Cho ∆ABC vuông tại B. Trên tia đối của tia BC lấy điểm D sao cho BD = BC a) Chứng minh rằng 𝐵𝐴𝐶 ̂ = 𝐵𝐴𝐷 ̂ b) Tính độ dài CD biết AB = 4cm, AC = 5 cm c) Kẻ BE vuông góc với AC ( E ∈ AC); BH vuông góc với AD ( H ∈ AD). ∆HBE là tam giác gì? Tại sao? d) ∆ABC cần có thêm điều kiện gì để ∆HBE đều
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