A = (-2.513162918859871, 3.6336789887640273)
B = Point(Circle[A, 8])
f = Segment(A, B)
O = Midpoint(A, B)
c = Circle(O, A)
C = Point(c)
g = Segment(A, C)
h = Segment(C, B)
α = Angle(A, C, B)