O(0, 0)

(1, 0)

(0, 1)

O = (0, 0)
A = (7, 0)
A' = Rotate(A, 90.0°, O)
α = Angle(A, O, A')
a = Ray(O, A)
B = (0, 12)
b = Ray(O, B)
Β = Point(a)
Α = Point(b)