b = 1 (slider from 0 to 5, step 0.1)
e: y = b
C = Point(e)
ω = 2 (slider from 0 to 5, step 0.1)
A: (x(C), 0.0)
t: x(A) / (b * ω)
P: (b * ω * t - b * sin(ω * t), b - b * cos(ω * t))
γ = CurveCartesian(b * ω * t - b * sin(ω * t), b - b * cos(ω * t), t, -3.141592653589793, 9.42477796076938)
c = Circle(C, A)
a = Segment(C, A)
d = Segment(C, P)
α = Angle(P, C, A)