Assuming you're talking about a rectangle:
Diagonal squared = length squared + width squared (Pythagoras)
so: Length squared = diagonal squared - width squared
ie length = sqrt (diagonal squared - width squared)
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If those numbers are length x width, the "width" usually refers to the smaller of the two numbers.
I can get you most of the way there volume÷height=length+width (so you can find 2 numbers which add up to the answer you get and those could be your length and width) hope this helps
If you have the length and the width, add them together and double that sum.
If Length * Width = Area, then Area ÷ width = Length
Area = (length) times (width)Length = (area) divided by (width)Width = (area) divided by (length)