N = (6, -1)
B = Point(Segment[N, (x(N) + 12, y(N))])
f = Segment(N, B)
c = Circle(N, f)
stap = 11 (slider from 0 to 11, step 1)
g = OrthogonalLine(N, f)
P, Q = Intersect(c, g)
h = Segment(P, N)
r = Line(P, f)
s = Line(B, h)
T = Intersect(r, s)
α = Angle(B, N, P)
t = Segment(T, B)
a = Segment(T, P)
δ = Angle(P, T, B)
β = Angle(N, B, T)
γ = Angle(N, P, T)
D = (0.028519364008794748, -3.1269834074819993)