O = (-42.38552682827654, -2.6183457699093378)
c = Circle(O, 10.0)
A = Point(c)
a = Segment(A, O)
B = Rotate(A, 285.0*°, O)
α = Angle(B, O, A)
b = Segment(O, B)
q = CircleArc(O, B, A)
p = CircleArc(O, A, B)