Square root of (diagonal2 - width2)
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length of diagonal of 20 of a 20 feet and 15 width.
you have to figure out length times width to get the formula for diagonal length suckers
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)
The diagonal is 26cm
Length = (1/2 of perimeter) minus (Width) Diagonal = square root of [ (Length)2 + (Width)2 ]