z_1 = (2, 0)
z_2 = (3, 0)
A = Intersect(xAxis, yAxis)
u = Vector(A, z_1)
v = Vector(A, z_2)
z_3: z_1 * z_2
w = Vector(A, z_3)
B = Point(xAxis)
α = Angle(B, A, z_1)
β = Angle(B, A, z_2)
γ = Angle(B, A, z_3)