The perimeter of each tile is 4 inches. So the perimeter of 16 tiles - separately - is 4*16 = 64 inches. The perimeter of a 16-tile shape depends on the shape.
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32 inches
16 x 16 inch tiles are actually (1 and 1/3) x (1 and 1/3) feet tiles which turns out to have an area of (4/3) x (4/3) = 16/9 square feet. So you want to cover 80 square feet. The number of tiles required is (80) / (16/9) = (80) x (9/16) = 45 tiles
It depends on the size of the tile. The number of 16cm x 16 cm tiles required will be quite different from the number of 16 inch x 16 inch tiles. Unfortunately, you do not specify which. And, if the tile was 16 ft x 16 ft, then 1 tile would be sufficient!
16X16=256 inches 12X12=144 inches=1 Square Foot 126X144=18144 18144/256=79 79 16X16 tiles
If the tiles are 1 foot squares, it will take 1,650 of them to cover 1,650 square feet. If the tiles are 16 inch square (1-1/3 square feet, each), then it would take 1,238 tiles.