20/12*20/12 = 25/9 square feet
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2.22 square feet.
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
= ( 20/12) x (42/12) sq feet
There are 144 sq. inches in a sq. foot, so 144 x 20 = 2880 sq. inches
You're talking about a measure of area here, so we'll assume you mean how many square feet. So: 60" x 20" = 1,200 square inches. 1 square foot = 144 square inches. 1,200 / 144 = 8 1/3 square feet.