Give equation to find the value of resultant vector and the direction of two vectors.
If $\vec{P}+\vec{Q}=\overrightarrow{0}$, then which of the following is necessarily true?
Figure shows $ABCDEF$ as a regular hexagon. What is the value of $\overrightarrow {AB} + \overrightarrow {AC} + \overrightarrow {AD} + \overrightarrow {AE} + \overrightarrow {AF} $ (in $\overrightarrow {AO} $)
Prove the associative law of vector addition.