O = (0, 0, 0)
A = (0, 0, 4)
a, c, b = Cone(A, O, 3)
B_1 = (0, 0, -4)
d, e, f = Cone(B_1, O, 3)
g = Segment(O, A)
C = Point(xAxis)
B = Point(xAxis)
h = Segment(B_1, A)
i = Segment(B, O)
j = OrthogonalLine(B, xAxis, space)
k = OrthogonalLine(B, i, space)
l = OrthogonalPlane(B, i)