u
\mathbf{u}
u
v
\mathbf{v}
v
∥
u
∥
=
4.5
\lVert \mathbf{u} \rVert = 4.5
∥
u
∥
=
4
.
5
∥
v
∥
=
4.5
\lVert \mathbf{v} \rVert = 4.5
∥
v
∥
=
4
.
5
cos
θ
=
0
\cos \theta = 0
cos
θ
=
0
u
⋅
v
=
0
\mathbf{u} \cdot \mathbf{v} = 0
u
⋅
v
=
0