180°-110°=70°
z°+60°+70°=180
z°=180-130
z°=50°
x+50=180°
x=180-50
x=130°
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180°-110°=70°
z°+60°+70°=180
z°=180-130
z°=50°
x+50=180°
x=180-50
x=130°