Question 812878
He wants as close to a square as possible; knowing this would come from an intermediate algebra exercise or from a beginning calculus exercise.
{{{30/4=7.5}}}, so for whole numbers only, try 7 and 8 meters.

Perimeter:  {{{2(7+8)=2*15=30}}}
The dimensions would be 7 meters by 8 meters.  The area would be 56 square meters.