O = (1.3, 1.96)
c = Circle(O, 2)
A = Point(c)
a = Ray(O, A)
B = Point(c)
b = Ray(O, B)
α = Angle(A, O, B)
M = Point(c)
d = Ray(M, A)
e = Ray(M, B)
β = Angle(A, M, B)
f = CircleArc(O, A, B)