Answer
See below.
Work Step by Step
The geometrical interpretation of the dot product of two vectors, let us say $u$ and $v$ (can be written as $u \cdot v$ ), can be thought of as the length of the projection of the vector $u$ on $v$ multiplied by the length of the vector $v$.
In equation form,
$ u \cdot v =|u| |v| \cos \theta$
or, $ u \cdot v =(|u| \cos \theta) |v|$
In the above equation, $|u| \cos \theta$, can be interpreted as the length of the projection of the vector $u$ on $v$.
