12.25 ft2
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10.5 square feet.
= ( 20/12) x (42/12) sq feet
42 If you are talking about a square yard, 36 inches x 36 inches = 1296 square inches or 9 square feet.
42 inches = 3.5 feet.
It depends on whether you mean 78 inches by 42 inches or 78 inches by 42 feet or miles or whatever.