A: (1, 2, 3)
B: (4, 5, 6)
f = Segment(A, B)
B1: (1, 5, 3)
h = Segment(A, B1)
B2: (4, 2, 3)
i = Segment(A, B2)
B3: (4, 5, 3)
j = Segment(B2, B3)
k = Segment(B3, B1)
B4: (1, 2, 6)
B5: (4, 2, 6)
l = Segment(B2, B5)
m = Segment(A, B4)
n = Segment(B4, B5)
p = Segment(B3, B)
B6: (1, 5, 6)
q = Segment(B4, B6)
r = Segment(B6, B1)
s = Segment(B6, B)
t = Segment(B, B5)
C1 = NaN