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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.
Usually, you divide by the area of a single tile. But this may not work if the tiles have an unusual shape, or if you need fractional tiles to cover the entire area.
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It depends on the dimensions used for the tiles. Clearly, one tile that is 9 ft * 12 ft will cover an area of more than 100 square feet. Second, it depends on whether or not the shape you wish to tile is "well-behaved". This will determine what proportion of the tiles will need cutting. Cutting tile will inevitably lead to wastage - unless you want a partial mosaic!