A: (1, 2, 3)
C: (-1, 2, -3)
C2: (1, 2, -3)
g = Segment(A, C)
C1: (-1, 2, 3)
f = Segment(C, C2)
h = Segment(C2, A)
i = Segment(A, C1)
j = Segment(C1, C)