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ice123
2 năm trước
Cho tam giác ABC có góc B= 60 độ, vẽ phân giác BD.Từ A kẻ đường thẳng vuông góc với BD,cắt BD tại H và cắt BC tại E a, tính số đo góc BAH. Chứng minh tam giác ABE là tam giác đều b,CM: tam giác DBA= tam giác DBE c,Từ A kẻ đường thẳng song song với BD cắt đường thẳng BC tại F. CM: Tam giác ABF là tam giác cân ( Vẽ hình giúp em với ạ)
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