A = (-3, 0)
B = (6, 6)
a = Line(A, B)
C = (6, 0)
b = Line(A, C)
c, d = AngularBisector(b, a)
D = Point(b)
E = Point(a)
e = Segment(D, E)
mid = Midpoint(E, D)
f = Line(A, mid)
α = Angle(C, A, B)