With Pythagoras' theorem:
diagonal2- length2 = width2
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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.
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
The diagonal is 26cm
The diagonal length is about 18.44 inches.