Answer:
71 M
Step-by-step explanation:
to find the perimeter you need to add up all the sides (length and width)
in this case they already gave you the perimeter: 306
and the length: 82
there are two sides that are the length so you need to do 82x2 which is 164
now you need to subtract 306-164=142
142 is the sum of the two width but its asking for only one side so 142 divided by 2 is 71
