the width is always shorter than the length. other than that, you would require more information about the rectangle (such as the area or the diagonal measurement) to ascertain the width
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You divide the perimeter by the width and you get the lenght
With Pythagoras' theorem: diagonal2- length2 = width2
the length of a rectangle is 8 more than the width. the area os 345 centimeters. find the length and width of the rectangle
If by that you mean knowing only the diagonal and the width, then by the formula a2+b2=c2, where a is the length, b the width and c the diagonal. To find the width b, you need to calculate sqrt(c2-a2). For example, the width of a rectangle with length 3 and diameter 5 is sqrt(52-32)=4
You square the width and subtract it from the diagonal squared. Then find the square root of this number, this number is now the length.