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a°=50°
sudut a° bersebrangan sama sudut 50° jd a°=50°

b°= 180°-(70°+50°) =60°

a°+b°+2c°=180°
50°+60°+2c°=180°
2c°=70°
c°=35

a°+2c° = 120°

a°+b°=110°

b°+2c°=130°