a) a = 53,2 ; c = 80,5
53.2^2 + b^2 = 80.5^2 --> b = 60.42
SIN(α) = 53.2/80.5 --> α = 41.37°
COS(β) = 53.2/80.5 --> β = 48.63°
b) c = 57,4 ; Beta = 9 Grad und 36` = 9 + 36/60 = 9.6°
COS(9.6°) = a/57.4 --> a = 56.59617252
SIN(9.6°) = b/57.4 --> b = 9.573
α = 90° - 9.6° = 80.4°