A = (-2, -4)
B = (10, -4)
C = (4, 4)
Vieleck1, a, b, c = Polygon(B, C, A)
d, w_α = AngularBisector(c, b)
f, w_β = AngularBisector(c, a)
h, w_γ = AngularBisector(a, b)
I = Intersect(w_β, w_α)
e = OrthogonalLine(I, a)
g = OrthogonalLine(I, b)
i = OrthogonalLine(I, c)
D = Intersect(w_γ, i)
E = Intersect(c, i)
F = Intersect(c, e)
G = Intersect(a, e)
H = Intersect(b, g)
j = Segment(I, G)
k = Segment(I, H)
l = Segment(I, E)
p = Circle(I, G)
α = Angle(A, H, I)
β = Angle(B, E, I)
γ = Angle(C, G, I)