Displacement vectors

Displacement is a vector $\vec{r} = r\angle \theta$, has magnitude $r$ ($r=|\vec{r}|$) and direction $\theta$.

Graphical vector addition: $\vec{C} = \vec{A} + \vec{B}$ i.e. first $\vec{A}$ and then $\vec{B}$

Of course, $\vec{A} + \vec{B} = \vec{B} + \vec{A}$, so it could be first $\vec{B}$ and then $\vec{A}$

Magnitudes do not just add: $C \neq A + B$