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ngoanquang77
2 năm trước
Vẽ góc aOb có số đo bằng 60 độ Vẽ góc aOb' là góc kề bù với góc aOb. Vẽ tia Oa' là tia đối của tia Oa A. nêu các cặp góc đối đỉnh. B. Tính số đo của các góc aOb' , a'Ob , a'Ob' C. Vẽ tia Ot là tia phân giác của góc aOb và tia Ot" là tia phân giác của góc a'Ob' . Chứng minh 2 tia Ot và Ot' đối nhau.
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