A = (1.98, 4.72)
B = (13.21640245010701, 4.6182007963603)
c = Circle(A, B)
C = Point(c)
D = Point(c)
E = Point(c)
a = Line(D, C)
b = Line(C, E)
α = Angle(D, C, E)
d = Tangent(D, c)
F = Point(d)
β = Angle(C, D, F)
e = Line(E, D)
γ = Angle(C, E, D)