O = (1.394857529443801, 2.898091107472118)
c = Circle(O, 4)
A = Point(c)
B = Point(c)
C = Point(c)
f = Segment(O, A)
g = Segment(O, B)
h = Segment(A, C)
i = Segment(B, C)
β = Angle(A, C, B)
α = Angle(B, O, A)