Square units of length. The exact units will depend on the size of the object:
A screen pixel may be measured in square millimetres, a postage stamp in square centimetres, a wall in square metres, city blocks in square kilometres.
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28 units
The area of a rectangle is (length) multiplied by (width). The units don't matter. Just make sure that 'length' and 'width' are both measured in the same unit, whatever the unit is.
6 units long and 5 units wide
42 <insert unit> squared.
Yes, the rectangle is one unit wide, and twenty units long. there are probably others, too.