To find the width, multiply the length that you have been given by 2, and subtract the result from the perimeter. You now have the total length for the remaining 2 sides. This number divided by 2 is the width.
So 18*2=36
Then 52-36=16
Then divid 16 by 2 because 16 is the result for both widths.
Answer, The width is 8.
