Question 893152
x and y dimensions.
Using 1*x and 2y for the fencing length, this length is x+2y.
{{{highlight_green(x+2y=100)}}}, and {{{highlight_green(xy=1200)}}}.


Either x or y could be considered length or width.  Solve for both and decide which goes by the name you want.  Two  equations in two unknowns; so solving should be no trouble.  Say if otherwise.