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the length of a rectangle is 8 more than the width. the area os 345 centimeters. find the length and width of the rectangle
Area of rectangle divided by its length = width of rectangle
If you know its dimensions then use Pythagoras' theorem to find the length of its diagonals.
You cannot find the area of a rectangle if you only know its length. You need to know its width too. Then you multiply its length by its width.
You really can't unless you know something else about the length or width or even the area of the rectangle. You have 2 unknowns (length & width) & only one equation (perimeter). In order to find 2 unknowns you need 2 equations, that's why you need to know something else about the rectangle such as how the length & width are related to each or the area of the rectangle. Hope that helps.