If it was 20 inches x 10 inches the perimeter would be 60 inches. which is the smallest possible perimeter with whole numbers
        
             
        
        
        
Answer: 19 feet
Step-by-step explanation:
Hi, since the situation forms a right triangle (see attachment) we have to apply the next trigonometric function.  
Tan α = opposite side / adjacent side  
Where α is the angle of depression of the dog, the opposite side (16) is Ted's eye level above the ground, and the adjacent side (x) is the distance between the dog and the barn door.
Replacing with the values given:  
tan40 = 16/x
Solving for x  
x =16/tan40
x= 19 ft  
Feel free to ask for more if needed or if you did not understand something.  
 
        
             
        
        
        
Answer:
conclusion because you are concluding eveything you said in the paragraph before.