2u

3u

4u

A_1=(a,b)

A_2=(2a,2b)

A_3=(3a,3b)

A_4=(4a,4b)

O = Point(yAxis)
A_1 = (2, 1)
A_2 = Mirror(O, A_1)
A_3 = Mirror(A_1, A_2)
A_4 = Mirror(A_2, A_3)
u = Vector(O, A_1)
u_2 = Vector(O, A_2)
u_4 = Vector(A_3, A_4)
u_3 = Vector(A_2, A_3)
A = Point(u_3)