18ft*20ft = 360 square feet
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20ft² = 1.858m²
18ft is equal to 6 yards so a square of 6yds x 6yds would have an area of 36 square yards.
30.096196 square meters
12 ft x 20 ft = 240 sq. ft.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.