Ce  quadri-faces  peut  se  prolonger  sous  2  formes  de polyèdre  à 6 faces  selon  l'arête  
choisie  [BD]  ou  [CE]. Utiliser le curseur Choix : 1 pour [CE] en vert, -1 pour [BD]  en bleu !

c = 2 (slider from -5 to 10)
a = 6 (slider from -5 to 10)
b = 0 (slider from -5 to 10)
h = 5 (slider from -5 to 5)
A: (0, 0, h)
B: (a, b, c)
C: (b, a, (-c))
D: ((-a), (-b), c)
E: (b, (-a), (-c))
t1, c_1, a_1, b_1 = Polygon(A, B, C)
t2, d, a_2, c_2 = Polygon(A, C, D)
t3, e, a_3, d_1 = Polygon(A, D, E)
t4, b_2, a_4, e_1 = Polygon(A, E, B)
t5, e_2, b_3, c_3 = Polygon(B, C, E)
t6, e_3, d_2, c_4 = Polygon(D, C, E)
t7, d_3, b_4, c_5 = Polygon(B, C, D)
t8, d_4, b_5, e_4 = Polygon(B, E, D)
Choix = 0 (slider from -1 to 1, step 1)