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pham1872001
2 năm trước
Bài 5: Cho tam giác ABC cân tại A, có góc A bằng 80 độ a) Tính góc B và góc C của tam giác ABC b) Vẽ BK, CD là 2 đường phân giác của tam giác ABC. Gọi giao của BK và CD là O. Tính góc BOC c) Chứng minh BD = CK; BK = CD d) Chứng minh DK//BC
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