Yes, I could draw three rectangles with 12 units, so long as the perimeter of the rectangles sum up to 12.
You're probably asking for integer lengths, though. A square is a special type of rectangle where all the sides are the same length, so I could have 3 squares with a side length of 1 unit, which gives 3x(1x4)=12 units.
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Thee different rectangles with an area of 12 square units are 3 by 4, 2 by 6 and 1 by 12.
1 x 5 2 x 4 3 x 3
There are three possibilities.. 1 x 12... 2 x 6 & 3 x 4
9
1 x 5 2 x 4 3 x 3