A = (-4.64, 1.56)
B = (1.1, 1.62)
C = (-2.06, 4.88)
c = Segment(A, B)
a = Segment(B, C)
b = Segment(C, A)
α = Angle(B, A, C)
β = Angle(C, B, A)
γ = Angle(A, C, B)