O = Intersect(xAxis, yAxis)
F = Point(xAxis)
a = Line(O, F)
b = OrthogonalLine(F, a)
ordA = 2.6 (slider from -10 to 10, step 0.1)
A: (2, ordA)
r = 2 (slider from 0 to 5, step 0.1)
d = Circle(A, r)
e = Line(O, A)
C, B = Intersect(d, e)
luogo1 = Locus(C, ordA)
luogo2 = Locus(B, ordA)