B = (8.9, -1.54)
f: y = y(B)
A = (7.3, 3.98)
a = Ray(A, B)
C = Point(f)
b = Ray(A, C)
c: x = x(B)
d: x = x(C)
D = Point(d)
e: y = y(D)
E = Intersect(c, e)
F = Point(b)
g: y = y(F)
G = Intersect(g, a)
h = Ray(A, D)
i = Ray(A, E)
j = Line(F, d)
k = Line(G, c)
H = Intersect(j, h)
I = Intersect(k, i)
t = 0.63 (slider from 0 to 1, step 0.01)
Q_1: C + t * Vector[C, F]
Q_2: B + t * Vector[B, G]
Q_3: E + t * Vector[E, I]
Q_4: D + t * Vector[D, H]