A square with a side length of 2.8 feet has an area of 7.84 square feet.
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(a - b)2 = a2 - 2ab + b2 square ft
To calculate the area of a rectangle or square, multiply side x side. So to get the square feet in a banner 5 ft by 8 ft, you would multiply 5 x 8, which is 40 square feet.
Multiply 10.2 times itself.
Area = 18 ft * 14 ft = 252 sq ft = 252/9 sq yards = 28 sq yards.
Oh, dude, finding the side of a square with an area of 25 sq ft is like finding your keys in the dark - not that hard. Since the area of a square is side squared, you just take the square root of 25 and boom, you've got yourself a side length of 5 feet. Easy peasy, lemon squeezy!