36 inches equal 3 feet. Therefore, 3 x 3 = 9 square feet.
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3 ft = 36 inches
1 square ft= 144 square inch
400 square feet = 400 x 144 = 57600 square inches Number of 60 x 60 square inch in 57600 is 57600/3600 = 576/36 = 16
24 inches = 2 ft 30 inches = 2.5 ft 2 ft x 2.5 ft = 5 square feet.
36 ft * 40 ft = 1440 sq feet.