Sum of the Angles in a Triangle

A = (2.5317663601947036, 1.6148707409410548)
B = (5.088668469442946, 3.5498236884802643)
C = (7.760746349378047, -0.4122228231476411)
poly1, c, a, b = Polygon(A, B, C)
α = Angle(C, A, B)
β = Angle(A, B, C)
γ = Angle(B, C, A)