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huyenmiiii
2 năm trước
Cho tam giác ABC có góc B = 60 độ . Vẽ phân giác BD. Từ A vẽ đường thẳng vuông góc với BD tại H và cắt BC tại E . Chứng minh : a) BD là trung trực của AE b) tam giác ABE đều c) Từ A kẻ đường thẳng song song với BD cắt đường thẳng BC tại F. Chứng minh tam giác BAF cân
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