For perimeter do i have to do unit squared

for example if the perimeter of a rectangle is 31.33 yards do i write 31.33 yd.2?...or do i just write 31.33 yd.?

No perimeter is just yards. Example: 31.33 yd

Area is yards squared. Example: 31.33 yd²

Volume would be units cubed. Example: mL³