a) O° < α < 180°

b) α = 180°

O = (-0.14, 1.34)
Control1 = (1.1, -0.9400000000000001)
c = Circle(O, Control1)
O1 = (8.14, 1.1400000000000001)
Control2 = (6.4, -1.22)
d = Circle(O1, Control2)
A = Point(c)
B = Point(c)
a = Segment(O, B)
b = Segment(O, A)
n = CircleArc(O, A, B)
m = CircleArc(O, B, A)
α = Angle(B, O, A)
C = Point(d)
e = Line(C, O1)
D = Intersect(d, e, 2.0)
f = Segment(C, D)