21 square units
We know that the area of parallelogram is given by:-
Let US denote the height of the Parallelogram RSTU with corresponding base ST.
By counting the distance between the points using grids or by distance formula,
Now, the area of parallelogram RSTU is given by:-
I do the box method. I took the pic, put it into MSPaint, and drew a box around the... b o x.
Then I took the area of the drawn box (7*7) and subtracted the area of the triangles you get.
The one on the top was a 7*3 and divided the result by 2 to get 10.5.
The bottom one is also a 7*3 and you still get 10.5.
Add em together to get 21.