Respuesta :
Answer:
36
Step-by-step explanation:
If each side of a square barn is 9 meters long, you can add them together in total to get 36.
					                   perimeter is 9*4, which is 36 meters. 
the area is 9*9, which is 81 meters squared.
					                
					             the area is 9*9, which is 81 meters squared.
 
			                  