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Just divide the number of square feet by 9 to determine square yards.
The correct way to figure square feet is to multiply length by width, so 20 X 22 = 440 sq ft.
You have given three measurements, which would make a solid figure of 128 cubic feet
a square foot is simply a square that is 1 foot by 1 foot if the area you need to measure is 3 feet by 6 feet you have 18 square feet (3 x 6 = 18) if the area is 10 feet by 10 feet you have 100 square feet (10 x 10 = 100) hope this helps!
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.