Multiply length times width.
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You multiply the two sides the object in order to find the square feet of an area
To find the area of a square with a perimeter of 12 feet, we first need to determine the length of one side. Since a square has four equal sides, we divide the perimeter by 4 to get each side length, which is 3 feet. To find the area of the square, we square the length of one side, so the area would be 3 feet x 3 feet = 9 square feet.
Find the area in square inches and divide by 144. (1 ft2 = 144 in2) Or, convert each side to feet by dividing by 12 (1 ft = 12 in) and then find the area which will be in square feet.
If the square has an area of 256 square feet then each side of the square is 16 feet because the square root of 256 is 16
To find the area of a rectangle, you multiply the length by the width. In this case, 40 feet multiplied by 80 feet equals 3200 square feet. So, there are 3200 square feet in a 40' by 80' area.