The diagonal of an 18x18 tile is 18*sqrt(2) = 25.46 units.
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One 18 inch x 18 inch tile = 1.5 ft x 1.5 ft = 2.25 sq ft.400 sq ft x 1 tile/2.25 sq ft = 177.77 = 178 tiles
18" = 1.5 feet 18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet
Since a square has right angles, you can use the Pythagorean Theorem to calculate the diagonal. Specifically, the diagonal of a square is equal to the length of a side, multiplied by the square root of 2.
Ah, the diagonal of a square is a special thing indeed. If you have a square that's 18 units on each side, you can use a little math magic to find its diagonal. By using the Pythagorean theorem, you'll see that the diagonal of this square would be 18 times the square root of 2. Just remember, there's always a way to find beauty and harmony in even the most geometric of shapes.
18 in x 18 in = 1.5 ft x 1.5 ft = 2.25 sq feet.