The perimeter is only the outer edge of the figure. We can split this up into the perimeter of the square, and the perimeter of the rectangle.
Square:
Only 3 sides of the square are visible in the perimeter.
3 + 3 + 3 = 9
Rectangle:
We have one full length, one shortened length, and 2 widths in the perimeter.
2(4) + (8 + 3) + 8 = 27
Figure:
Now that we know the perimeter of the rectangle and square, we need to add them together to find the area of the figure.
27 + 9 = 36
The perimeter is 36 feet.
Hope this helps! :)