u = Vector((1, 2, 1))
v = Vector((0, 5, 1))
w: u ⊗ v
s: u + v
A = Point({1, 7, 2})
O = Point({0, 0, 0})
B = Point({0, 5, 1})
C = Point({1, 2, 1})
c1, o, b, a, c = Polygon(O, B, A, C)
d: u ⊗ v
e: sqrt((-3)^(2) + (-1)^(2) + 5^(2))