a, Vẽ góc AOB=40 độ b, Vẽ góc AOB' là góc đối đỉnh với góc AOB c, Theo cách vẽ đó, ta có thêm cặp góc nào là hai cặp góc đối đỉnh?Tại sao? d, Vẽ tia OI là tia phân giác của góc AOB và vẽ tia OI’ là tia đối của tia OI. Chứng tỏ tia OI’ là tia phân giác của góc AOB' Giúp mình với có 5s và trl hay nhất

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