When calculating area we multiply length and width ( in the instance of a square ). If we had an area 5 in long and 5 in wide the area is 25 in^2 because we also multiply the unit. If we had a box 5 in long, 5 in wide and 5 in tall we would have a box with a volume of 125 in^3 ( cubic inches). Again we also multiply the units.
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None. Area cannot be measured in length units - only in squares of such units.
Area can be measured in square inches.
Yes, since they're squares. They can only be 3 inches by 3 inches if they are square. So they all have the same area.
It is an area.
No. In fact, surface area is never measured in inches.