The best way to do this is convert it all to inches. 148 inches by 143 inches. This gives you 21,164 square inches. Divide by 144 to get a total of 147 square feet.
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80 square feet x 15 = 1200 square feet.
12 feet x 12 feet = 144 square feet.
10.8 x 8 = 86.4 square feet.
10' x 18' = 180 square feet.
12' x 10' = 120 square feet.