If you are talking about a rectangle, 5x4 us 20 ft squared
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336 in
36 ft squared
It allows for the whole of the shape to have been acounted for. A square is measured in the same way except that it height and length figure will always be the same i.e 5feet x 5feet.
Multiply your length by your width 8 ft x 4 ft = 32 square feet
149.86 cm