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Multiply by the square root of 2.
multiply the width by 2 and then subtract that to the perimeter then divide the answer by 2 to get the length
You need to know the length and width of the desk before you can determine the area. Multiply the length by the width to get your answer (length x width = area).
The law of tangents can be used to determine another side length; the sine rule can then be used to determine the third side length.
The perimeter of square is 4 x length If you have perimeter only divide by 4 to get length and The area of square is length x length If you already have length that is all you need to know