Does this room have depth? Or do you just want the square feet of the floor? By 6x6 do you mean 6'x6', what unit of measure are those 6's?
If the unit of measurement of those 6's are feet, then the floor would be 6 square feet.
264
76.6 tiles
440 6-inch square tiles.
The answer depends on the units used for 6x6. It should be obvious that the number when it is 6" by 6" will not be the same as when it is 6 ft x 6 ft.
143 square feet
36 square feet (6x6=36)
264
240
76.6 tiles
440 6-inch square tiles.
95 square feet.
It takes 4 6x6 inch tiles to cover a square foot. You will need 180 tiles, plus some for spoilage and mistakes.
400 square feet.
If it's a square room then the room size is 14 feet by 14 feet
The answer depends on the units used for 6x6. It should be obvious that the number when it is 6" by 6" will not be the same as when it is 6 ft x 6 ft.
225 square feet
A room that is 12 feet by 13 feet is 156 square feet in area