a ) 180° - 56° = 124°
α = 124°
b ) 180° - 37° - 90° = β
β = 53°
c ) 180° - 49° - 78° = γ
γ = 53
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a ) 180° - 56° = 124°
α = 124°
b ) 180° - 37° - 90° = β
β = 53°
c ) 180° - 49° - 78° = γ
γ = 53