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nguyenthingocthuan2002mn
2 năm trước
trên đường thẳng AA' lấy điểm O . Trên một nửa mặt phẳng AA' vẽ tia OB , trên nữa mặt phẳng bờ chứa tia OC sao cho góc AOB = góc AOC =150 độ a. Tính góc BOC b. Tia OA' có phải là tia phân giác của góc BOC kô ? Vì sao
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