None but there are 4 feet in 48 inches
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48 x 60 inches is 20 square feet.
1 sq ft is equal to 144 sq in.
51" by 25" = 51*25 = 1275 sq inches = 1275/(12*12) sq ft = 8.854 sq ft (to 3 dp)
1728 sq. in.
1 ft = 12 inches. 1 square foot = 1 ft x 1 ft = 12 inches x 12 inches = 12*12 sq inches = 144 sq inches.