A: (1, 2, 3)
a = Vector((-1, 1, -1))
b = Vector((2, -1, 1))
B = Translate(A, a)
u = Vector(A, B)
D = Translate(A, b)
v = Vector(A, D)
C = Translate(D, Vector[(3 * a)])
kuvio1, a_1, b_1, c, d = Polygon(A, B, C, D)