# How do I determine the vector projection of a vector?

Aug 4, 2018

#### Explanation:

The vector projection of $\vec{b}$ onto $\vec{a}$ is

$p r o {j}_{\vec{a}} \vec{b} = \frac{\vec{a} . \vec{b}}{| \vec{a} {|}^{2}} \vec{a}$

Calculate the dot product

$= \vec{a} . \vec{b}$

and calculate the modulus of $\vec{a}$

$= | | \vec{a} | |$