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α = 180 - 30*2 = 180-60 = 120
γ = 180 - 25*2 = 180 - 50 = 130
β = 360 - (120+130) = 360 - 250 = 110
b)
α = 180- 2*50 = 180-100= 80
γ = 180- (40 +45) = 180 - 85 = 95
β= 360 - (80+95) = 360 - 175 = 185