Question 878551
How accurately do you want to know the length?
The golden ratio is {{{1}}}:{{{(1+sqrt(5))/2}}}.
Decide which part you want corresponding to your 20 foot width.


The ratio can also be approximated as 1 to 1.618.


If you want the width to be shorter than the length, then {{{w/L=1/1.618}}}. If you want the width to be longer than the length, then {{{L/w=1/1.618}}}.