If the initial point is
and the terminal point is
, then the position vector is 
Area of the parallelogram :
\If
and
are adjacent sides of a parallelogram, then the area of the parallelogram is
.
The points are
and
.
The position vector is 
Substitute
and
in
.

Substitute the points
and
in
.

The vectors are
and 

The position vectors
and
are adjacent sides of a parallelogram.
Find the area of the parallelogram.
\The area of the parallelogram is 

The area of the parallelogram is
sq-units. \ \
The area of the parallelogram is
sq-units.