A = (-1, 0)
Z = (3.488888888888889, 1.6407407407407408)
O = Intersect(xAxis, yAxis)
c = Circle(O, A)
W = Point(c)
w = Vector(O, W)
z = Vector(O, Z)
summe: w + z
Prod: (x(Z) x(W) - y(Z) y(W), x(Z) y(W) + y(Z) x(W))
produkt = Vector(O, Prod)