u: 1 / ((2 * sqrt(2)))
B: ((-(1 / 2)), sqrt(3) / 2, (-u))
A: ((-(1 / 2)), (-(sqrt(3) / 2)), (-u))
C: (1, 0, (-u))
D: (0, 0, (3 * sqrt(2) / 4))
f = Segment(D, A)
g = Segment(D, B)
h = Segment(D, C)
i = Segment(A, B)
j = Segment(B, C)
k = Segment(C, A)