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quynhtae2510
2 năm trước
Bài 4. (3,5 điểm) Cho tam giác ABC vuông tại A, kẻ đường phân giác BD của ( D thuộc AC). Trên cạnh BC lấy điểm E sao cho BE = BA. a) Chứng minh và DE⏊BC . b) Gọi F là giao điểm của đường thẳng DE và đường thẳng AB. Chứng minh tam giác BFC cân. c) Tia BD cắt FC tại N, trên tia đối của tia NB lấy điểm M sao cho NM = ND. Chứng minh FM // CD. d) Tính chu vi tam giác ABC biết ; BC = 15cm.
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