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khangnd7870
2 năm trước
Cho aOb=70 độ . Biết Ot là tia phân giác của aOb Tính số đo aOt và bOt . Gọi Oc là tia đối của tia Oa. Tính số đo bOc Trên nửa mặt phẳng bờ là tia Oa chứa tia Ob, Ot vẽ tia Od sao cho tOd=90 độ Tính số đo dOb Chứng tỏ rằng Od là phân giác bOc vẽ hình luôn giùm mình nha !!!
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