1. The problem statement, all variables and given/known data Given is a triangle with sides a=3.1cm, b=5cm, c=4.7cm and opposite angle to side a, α=36°. I must find out for angles β and γ using the law of sines. 2. Relevant equations Law of sines. 3. The attempt at a solution I first tried: sin(γ)}/c=sin(α)/a ⇒ γ≈63.02° β=180-α-γ=80.98° However, one could also calculate: sin(β)}/b=sin(α)/a ⇒ β≈71.45° γ=180°-α-β=72.55° Two approaches, that I believed to be equivalent, but which furnish different results. So, I obviously make something wrong. But ... I don't get it... what is it?