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nghiaphan1009
2 năm trước
Trên nửa mặt phẳng B chứa tia OA vẽ góc AOB = 80 độ, góc AOC = 130 độ a,Trong ba tia OA,OB,OC thì tia nào là tia nằm giữa. b,So sánh góc AOB và BOC. c,OB có phải là tia phân giác của góc AOC vì sao. d,Gọi tia OA là tia đối của tia OA chứng tỏ rằng OC là tia phân giác của góc BOD
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