Q: How do find the width of a rectangle when you only have the length?

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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.

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

If the only known fact is the length of the diagonal then the width and length of the rectangle CANNOT be determined. The diagonal could be that of a square, or of a rectangle that is very long but quite narrow. Consequently at least one more fact is required such as; the dimension of either the length or the width, or the angle that the diagonal makes to the base of the rectangle or even the area of the rectangle.

-- Slice it down one side and flatten it out. -- Now you have a rectangle. You only have to find the area of a rectangle. -- The area of a rectangle is (length) times (width). -- The length of the rectangle used to be the length of the cylinder. -- The width of the rectangle used to be the circumference of the cylinder's round ends, while it was still rolled up.

A rectangle has only two dimensions, for example, length and width. The longest side is usually called the length, the other side, the width.

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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.

It is not possible.

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

you cannot do this; you have area only and two unknowns - lengthand width but only one equation: area = length x width

If the only known fact is the length of the diagonal then the width and length of the rectangle CANNOT be determined. The diagonal could be that of a square, or of a rectangle that is very long but quite narrow. Consequently at least one more fact is required such as; the dimension of either the length or the width, or the angle that the diagonal makes to the base of the rectangle or even the area of the rectangle.

-- Slice it down one side and flatten it out. -- Now you have a rectangle. You only have to find the area of a rectangle. -- The area of a rectangle is (length) times (width). -- The length of the rectangle used to be the length of the cylinder. -- The width of the rectangle used to be the circumference of the cylinder's round ends, while it was still rolled up.

A rectangle has only two dimensions, for example, length and width. The longest side is usually called the length, the other side, the width.

Its impossible to isolate both the length and width, but you can figure out the sum of one pair of length and width, which is 13.

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

yes

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.

With Pythagoras' theorem: diagonal2- length2 = width2