Question 861283
The rectangle, dimensions x and 9.  Perimeter would be {{{2x+2*9=2x+18}}}.


The rectangle's width is x while its length is 9.



The square uses side length x also, and perimeter is {{{4x=20}}}; meaning {{{highlight(x=5)}}}.


Back to perimeter of the rectangle, 
{{{2*x+18}}}
{{{2*5+18}}}
{{{10+18}}}
{{{highlight(28)}}}, the perimeter of the rectangle.