u = Vector((2, 3, 6))
v = Vector((10, 2, -11))
α = Angle(v, u)
A: (0, 1, -3)
a: (10 * x) + (2 * y) - (11 * z) = 3
f = IntersectPath((x + 1) / 2 + (0 * z) = y / 3, (x + 1) / 2 = (z - 3) / 6)
β = Angle(f, a)