20" = 1 foot 8 inches.
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20 inches are 1.6666666667 feet.
20/12*20/12 = 25/9 square feet
There is 20 feet in 240 inches
20 feet and 7 inches.
You can not convert that as 20 inches are LENGTH and Square Feet is AREA If you meant 20 square inches however then... 1 square foot is 12 * 12 or 144 square inches. so 20 square inches would be 20/144 or 0.139 square feet