F = (1.44, 2.34)
A = (-3, -2)
B = (3, 0)
g = Line(A, B)
c = Parabola(F, g)
S = Vertex(c)
P = Point(c)
a = OrthogonalLine(P, g)
D = Intersect(g, a)
d = Segment(P, D)
α = Angle(P, D, B)
b = Segment(F, P)