r = 3.7 (slider from 0 to 10, step 0.1)
O = (0.32, 1.2)
c = Circle(O, r)
A = Point(c)
B = Point(c)
M = Point(c)
a = Segment(O, B)
b = Segment(O, A)
d = Segment(M, A)
e = Segment(M, B)
α = Angle(A, M, B)
β = Angle(A, O, B)
γ = Angle(B, O, A)
δ = Angle(B, O, A)
ε = Angle(A, O, B)
f = CircleArc(O, A, B)
g = CircleArc(O, B, A)