Cho ^ABC , góc C bằng 70 độ, góc A bằng 40 độ.Trên tia đối tia AC lấy điểm O. Trên nửa mặt phẳng bờ AC có chứaB, vẽ tia Ox sao cho góc xOA bằng 110 độ.
a, Chứng minh: Ox//BC.
b, Kẻ tia At là tia phân giác của góc OAB. Chứng minh: At//BC.
c, Kẻ tia AN là phân giác góc BAC. Chứng minh AN vuông góc At.
d, Chứng minh: AN vuông góc với BC,AN vuông góc với Ox.

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