Question 1149570
"l" looks like "1".
"L" looks different.
If using L for "length", then


{{{W=kL/d^2}}}

and then {{{k=Wd^2/L}}}.


{{{k=6*3^2/6}}}

{{{k=9}}}


The model, {{{highlight(W=9(L/d^2))}}}