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The formula for a rectangle is Length multiplied by width. The area is 21,780ft squared. If both sides are equal, then the square root of the area is a length of 147.58 feet. This is just if it's a square. If it's a rectangle both sides will vary a bit from that, and to get either, you have to measure the other length also.
As a rectangle has two pairs of sides of equal length the other two sides must also be 8 feet and 10 feet.
If one of the sides is 8 feet, the perimeter is 32 feet and the area is 64 square feet.
Both sides of one of its diagonals
You can calculate the number of square feet in a two-dimensional rectangle by multiplying the length of one of the short sides by the length of one of the long sides. 9' x 12' = 108 square feet