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supersaiyamama
2 năm trước
Giup em với à nha ! Bài tập : Cho tam giác ABC cân tại A. Trên cạnh BC lần lượt lấy hai điểm M, N sao cho BM = CN. a) Chứng minh rằng là tam giác cân . b) Kẻ BH AM ( H AM ), kẻ CK AN ( K AN ). Chứng minh rằng BH = CK, AH = AK. c) Gọi O là giao điểm của BH và CK. Tam giác OBC là tam giác gì ? Vì sao ? d) Khi và BM = MN = CN, hãy tính số đo các góc của tam giác ABC.
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