Question 1175511
corner "edge" or corner "edges"?   "Its corner edge" as written means just one of the corners; not all four of them.


x the edge length of the square planted area
{{{(x+3)(x+3)=18000}}}


{{{x+3=sqrt(18000)}}}

{{{x=-3+sqrt(18000)}}}


{{{x=131.16}}}------------but probably not the intended interpretation.