A = Point(zAxis)
a = Plane(A, xOyPlane)
B = Intersect(yAxis, zAxis)
C = PointIn(a)
D = Intersect(yAxis, xAxis)
b = Line(B, D)
E = PointIn(a)
F = PointIn(a)
c = Line(E, F)
G = Point(c)
d = Line(B, G)