Hey there!
To find perimeter you add up all the sides so in this case, you will add the number 8 two times, and the number 11 two times . . .
8 + 8 = 16
11 + 11 = 22
16 + 22 = 38 <----------
The perimeter of the rectangular sheet of paper is 38 inches.
Hope this helps you.
Have a great day!