Trên đường thẳng AA' lấy điểm O. Trên một nửa mặt phẳng bờ AA' vẽ tia OB trên nửa mặt phẳng bờ còn lại vẽ tia OC sap cho góc AOB=AOC=150 độ a) Tính góc BOC b) Tia OA' có phải là tai phân giác của góc BOC không? Vì sao? ko cần vẽ hình nha

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