Formula for area of a rectangle with a length 4 meters can be said to be 4 x W = 4W.
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Perimeter of a rectangle = twice (length + width), in this case 22 m.
A 6 by 4 rectangle will have a perimeter of 20 units
4000 mm = 4 meters and 12000 mm = 12 meters So: 4*12 = 48 square meters
A rectangle with width 4 can have any length!
Same as for a rectangle. For a square, this can be simplified to "4 times the length of a side" - since all sides have the same length.