Trên cùng một nửa mặt phẳng bờ chưa tia Ox,vẽ các tia oy,oz sao cho góc xOy bằng 45 độ,góc xOz bằng 120 độ Vẽ tia Om là tia đối của tia Oy.Vẽ tia Ot sao cho góc mOt bằng 30 độ và tia Ot mằn khác phía với tia Ox so với bờ là đường thẳng chứa tia Om.Tính yOt,chứng minh Oz là p/g của góc yOt

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