A = (1.3476662293379285, -3.831615352121274)
B = (20.388874714908432, -16.73557482168147)
C = (13.884439860333384, 7.551145643385079)
mnogokotnik1, c, a, b = Polygon(A, B, C)
α = Angle(B, A, C)
β = Angle(C, B, A)
γ = Angle(A, C, B)
d = LineBisector(A, C)
e = LineBisector(A, B)
T = Intersect(d, e)
f = LineBisector(C, B)
A' = Intersect(c, e)
B' = Intersect(a, f)
C' = Intersect(b, d)
δ = Angle(A, C', T)
ε = Angle(T, B', B)
ζ = Angle(B, A', T)
η, θ, ι = Angle(mnogokotnik1)