Question 1041806
If the perimeter is 38m, then that represents 2x the length plus 2x the width, or
P=2L+2W
2L+2W=38
2L=38-2W
L=19-W. 
So:
W(19-W)=84
19W-W²=84
W²-19W+84=0
(W-7)(W-12)=0
W=7 or 12
The campsite is 7m x 12m. ☺☺☺☺