k = 1.6 (slider from -5 to 5, step 0.1)
u: (12, 0)
F = Point(u)
A = (5.030377459396721, 2.8029969343226613)
v = Vector(F, A)
w: (k * v)
G = Point(u)
B = Point(w)
f = OrthogonalLine(A, u)
g = OrthogonalLine(B, u)
C = Intersect(f, xAxis)
D = Intersect(xAxis, g)
α = Angle(G, D, B)
β = Angle(G, C, A)