G: (0, 0, 0)
H: (0, 0, 120)
I: (10, 0, 120)
J: (10, 0, 15)
K: (15, 0, 10)
L: (85, 0, 10)
M: (85, 0, 0)
surface, a, b, c, d, e, f, g = Polygon(G, H, I, J, K, L, M)