Ringjoon: (x + 2)^(2) + y^(2) = 1
A = Point(Ringjoon)
A_x: (x(A), 0)
B: (-2, 0)
D: (-1, 0)
O: (0, 0)
f = Segment(B, A)
g = Segment(A, A_x)
kaar = CircleArc(B, D, A)
α = Angle(D, B, A)
C: (α, 0)
i = Segment(O, C)
Y: (90° - α, y(A))
h = Segment(A, Y)