C = (-0.49999999999999867, 1.6199999999999999)
B = (8.34, 1.62)
a = Line(C, B)
A = (8.34, 5.26)
b = Line(C, A)
D = Point(b)
c = Line(A, B)
d = Line(D, c)
E = Intersect(a, d)
α = Angle(d, a)