i = (0, 1)
r1 = 2
r2 = 3
k = -0.4
θ = 8.71 (slider from 0 to 50, step 0.01)
e = 2.718281828459045
M: 0.5 * (r1 * e^(i * θ) + r2 * e^(i * k * θ))
O = (0, 0)
c = Circle(O, r1)
d = Circle(O, r2)
M1: r1 * e^(i * θ)
M2: r2 * e^(k * i * θ)
a = Segment(M1, M2)