324 square feet. Multiply the two dimensions - the result is the number of square feet.
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2.25 square feet
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.
10
67 tiles.
288