G:((1.98 * 2), (5.9 * 2))
G':((1.98 * 2), (1.88 * 2))
T:((1.16 * 2), (5.42 * 2))
T':((2.67 * 2), (6.4 * 2))
traction = Vector(T, T')
poids = Vector(G, G')
S:((3.28 * 2), (2.14 * 2))
S':((2.17 * 2), (5.4 * 2))
reaction = Vector(S, S')
A:(0, 2)
B:(18, 2)