O = (2.5191905189296877, 3.4457487773942925)
c = Circle(O, 4)
A = Point(c)
B = Point(c)
C = Point(c)
f = Segment(A, O)
g = Segment(O, B)
h = Segment(B, C)
i = Segment(C, A)
α = Angle(B, O, A)
β = Angle(B, C, A)