kahden suoran välinen kulma

f: ((x - 5) / 4 + (0 * z) = (y + 2) / -3,(x - 5) / 4 = (z - 0) / 1)
u = Vector((-2, 3, -4))
v = Vector((2, -2, 3))
g = Line((-2, 3, -4), v)
A = Point(f)
h = Line(A, g)
B = Point(h)
C = Point(f)
α = Angle(B, A, C)