E_1 = (-6.057978163022511, -11.480476279221453)
B = (-2.153662517700241, -6.7734041460759125)
C = (9.048439380560858, -6.809893077340607)
a = Segment(B, C)
b = LineBisector(a)
A = Point(b)
H = Intersect(b, a)
c = Segment(B, H)
d = Segment(H, C)
e = Segment(C, A)
f = Segment(A, B)
g = Segment(A, H)
α = Angle(C, H, A)