A = (8.38, -3.96)
B = (4.12, 1.2)
c = Circle(A, B)
a = Line(B, A)
b = OrthogonalLine(B, a)
C = Point(b)
D = Point(c)
d = Segment(B, D)
E = Point(c)
e = Segment(B, E)
f = Segment(D, E)
α = Angle(B, E, D)
β = Angle(C, B, D)
γ = Angle(D, E, B)