A = (-0.304, -5.514)
B = (5.702, 1.944)
C = (13.27, -5.382)
pol1, c, a, b = Polygon(A, B, C)
α = Angle(C, A, B)
β = Angle(A, B, C)
γ = Angle(B, C, A)
d = Line(B, b)
e = Ray(A, B)
D = Point(e)
f = Ray(B, D)
g = Ray(C, B)
E = Point(g)
h = Ray(B, E)
β' = Angle(f, h)
γ' = Angle(h, d)
F = Point(d)
G = Point(d)
i = Ray(B, F)
α' = Angle(i, f)
δ = Angle(F, B, G)
s: α + β + γ
texto1: "$ \alpha+\beta+\gamma =" + (LaTeX[s]) + "$"