Trên cùng nửa mặt phẳng bờ chứa tia Ox , vẽ hai góc xOy = 30 độ , xOz = 120 độ a) Trong ba tia Ox , Oy , Oz tia nào nằm giữa hai tia còn lại ? Vì sao ? b) Tính số đo của góc yOz . Góc yOz là góc nhọn , góc vuông hay góc tù ? Vì sao ? c) Vẽ Ot là tia đối của tia Ox . Tìm số đo của góc zOt và góc yOt . d) Trong các tia Oy , Oz , Ot thì tia nào nằm giữa hai tia còn lại ? Vì sao ?

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