C = Intersect(xAxis, yAxis)
r: 2
crc = Circle(C, r)
B = Point(crc)
A: (x(B), (-y(B)))
setAB = CircleSector(C, A, B)
setBA = CircleSector(C, B, A)
latoA = Segment(C, A)
latoB = Segment(C, B)
srettaA = Ray(C, A)
sRettaB = Ray(C, B)
asse = AngularBisector(A, C, B)
D = Mirror(A, sRettaB)
setBD = CircleSector(C, B, D)