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ngyetanharmy2013
1 năm trước
Cho Δ ABC vuông tại A, đường phân giác BE(E ∈ AC). Kẻ EH ⊥ BC (H ∈ BC). Gọi K là giao điểm của AH và BE. CMR: a) Δ ABE = Δ HBE b) BE là đường trung trực của AH c) Nếu ∠C = 30° thì Δ ABH là tam giác gì? d) Biết AB = 5cm và ∠C = 30°. Tính độ dài cạnh BC
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