12' * 21 ft = 12*21 sq ft = 252 sq ft.
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12 X 21 = 504 12x12 tiles* * * * *The mathematical answer is exactly half that:12*21 = 252 not 504!
144 sq ft
How many cubic ft.in a room 12 ft.by 10.6 ft. by 8 ft. high?
21*19 = 399 square feet.
12 ft x 41 ft = 492 sq ft