Question 927533
length (l)= 12 feet
diagonal (d)= 15 feet
as per Pythagorean theorem,
     {{{ diagonal^2  = length^2+width^2}}}
     {{{ 15^2 = 12^2+width^2}}}
          {{{225= 144+width^2}}}
         move 144 to the left
        {{{225-144 = width^2}}}
         {{{ 81=width^2}}}
         apply square root on both sides
 {{{ sqrt(81)= sqrt(width^2)}}}
       9 =width
so width  = 9 feet
Result : WIde =9 feet