169 square feet. Multiply the two dimensions - the result is the number of square feet.
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About 1.2 square feet x 63 tiles
It is not possible to answer the question because the units of measurement for the tile are not given.
The best way to figure out how many 13x13 tile will be needed to cover 30 sf of floor is to calculate 13x13/144 give coverage per tile (1.1736), then take 30/1.736 = 25.56 tiles.
Answer: 184 assuming no waste... There will be waste and broken tiles. Get an extra case. Math: 13in X 13in = 169 Square inches 169 Square inches / 144 Square inches per square foot = 1.17 square foot per tile 215 square feet / 1.17 square feet = 184 tiles
D = 18.385 units.