Question 1113407
Assume the playing field has the shape of a rectangle. 


Then w + w + (w + 45) + (w + 45) = 282


4w+90=282


w=48 ft, l=93 ft (Answer)


You can imagine perimeter this way: pick any edge. Then the perimeter is the distance you would have to travel around the figure to return to that point, without crossing any segment more than once.