A = (0.5088888888888888, 0.42)
c = Circle(A, 1.0)
B = Intersect(xAxis, yAxis)
Z = Point(c)
absZ = Segment(B, Z)
D = Point(xAxis)
argZ = Angle(D, B, Z)
W: (absZ^(2.0); 2.0 * argZ)
軌跡1 = Locus(W, Z)
absW = Segment(W, B)
argW = Angle(D, B, W)