O = (9.26, -1.58)
c = Circle(O, 4)
A = Point(c)
B = Point(c)
C = Point(c)
f = Segment(O, A)
g = Segment(O, B)
h = Segment(C, A)
i = Segment(C, B)
α = Angle(B, O, A)
β = Angle(B, C, A)