30 x 4 = 120 Square feet
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450 square feet.
2 feet wide and 300 feet long, 3 feet wide and 200 feet long. 6 feet wide and 100 feet long. 10 feet wide and 60 feet long 20 feet wide and 30 feet long. I could go on and on and on and on and on and on and on.
51 inches wide x 30 inches long = 10.625 square feet.
Well, if you're talking about a square, then the perimeter is twice the length plus twice the width; in this case it would be 30 feet...
Without a second measurement of width, there is no way of knowing. Linear is length and square foot is area. You have to know length and width to figure it. 30 linear feet 1 foot wide would be 30 square feet.