a = 15.3 cm

α = 40⁰

β = 80⁰

A = (0.9572603669743756, 2.799966851846398)
B = (5.2998777229219645, 2.6738654404214226)
C = (4.86, 5.9)
Vieleck1, c, a, b = Polygon(A, B, C)
α, β, γ = Angle(Vieleck1)