Depends what size each piece is !
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The floor's area is: 1,296 square feet.
The area of the floor is 1296 square feet.
21*3 = 63 square feet.
1 square foot is 0.111 square yards. The floor area is 9feet x 21feet = 189 square feet. Therefore, the total square yards is: 189 square feet x 0.111 square yards/foot squared = 21 square yards Therefore, there is 21 square yards of floor.
One piece = 4 x 12 = 48 square feet 665 pieces cover (665 x 48) = 31,920 square feet 3,5462/3 square yards 0.001145 square mile (rounded).