A = (-3.5182, 2.8338)
B = (5.2422, -0.8446)
f = Line(A, B)
C = (5.2664, 4.3826)
D = (-4.0748, -2.6596)
g = Line(C, D)
E = Intersect(f, g)
α = Angle(A, E, D)
β = Angle(B, E, C)
γ = Angle(A, E, C)