18 x 18 inch square is equal to
3/2 x 3/2 foot square = 9/4 square foot.
To cover 154 foot square (you don't mean 154 square feet) is
(154 x 154) / (9/4)
= (154 x 154 x 4) / 9 = 10540.44, so you will need 10541 tiles
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160 of them.
A square foot is a measure of area.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
Shape. A square foot is any area of 144 squinches. A linear square foot, should such a name exist, would probably be a square 12 inches to the side.
That would be an area virtually indistinguishable from 430 ft2 .