Question 913573
Assuming you mean, the outside perimeter of the path around the garden for the fencing material, finding this is straightforward.


No variables are needed.
One measure for the entire rectangle region is {{{33+2*3=39}}} feet; and the other measure for the region is {{{39+2*3=45}}} feet.  The perimeter for the fencing material is {{{2(39)+2*(45)=highlight(168)}}} feet.