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daothikimtrinhshpy
2 năm trước
1.Cho tam giác ABC cân tại A.Kẻ AD vuông góc với BC (D thuộc BC).Chứng minh rằng: BD=CD 2.Cho tam giác ABC vuông tại A(AB<AC) .Trên cạnh BC lấy điểm D sao cho BD=BA.Qua D kẻ đường thẳng vuông góc với BC, cắt cạnh AC tại E. a.Chứng minh rằng: BE là tia phân giác của góc ABD b.Gọi I là giao điểm của của BA và DE .Chứng minh tam giác ABC cân.
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