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anhhihi1512
2 năm trước
Cho tam giác ABC cân tại A, có góc BAC=30 độ, đường cao BD. Trên tia BD lấy điểm K sao cho BK=AB. Đường phân giác góc A của tam giác ABC cắt BD tại H. Chứng minh: a) Tam giác ABH = tam giác HAC b) Tam giác ABK đều c) Gọi E là trung điểm của AB. Chứng minh CH vuông góc với KE d) CH = 2 AD
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