u = Vector((2, 6, 3))
v = Vector((2, -1, -2))
α = Angle(v, u)
A: (0, 1, -3)
a: (2 * x) - y - (2 * z) = 4
f = IntersectPath((x - 2) / 2 + (0 * z) = (y + 1) / 6, (x - 2) / 2 = (z + 3) / 3)
β = Angle(f, a)