A perimeter is measured in LINEAR units. Neither 'square' units nor 'cube' units.
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Neither. Volume is cubic units and area is square units. Perimeter is just units.
Then what do you measure it with?
A 20-unit square has a perimeter of 80 units.
A square with an area of 400 square units has a perimeter of 80 units.
Area is measured in squared units, such as cm^2. One centimetre squared is a box that is 1cmx1cm. Perimeter is measured in normal units, such as centimetres.
units square= area units= perimeter