perimeters will always be length so we have units of lenght such as mm, inch, feet etc. NOT area, so no square feet or square yards etc.
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Neither. Volume is cubic units and area is square units. Perimeter is just units.
A 20-unit square has a perimeter of 80 units.
units square= area units= perimeter
49.5 units
Perimeter = 40+40+60+60 = 200 units