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A quarter of a square foot
36" x 40" = 1440 square inches
There are 144 square inches per square foot; so multiply by 144. 36 sq ft X 144 sq in / sq ft = 5184 sq inches
One foot = 12 inches so 36 inches = three feet.
42 If you are talking about a square yard, 36 inches x 36 inches = 1296 square inches or 9 square feet.