I know 17. The formula for INTERIOR angles is 180(n-2) divided by n. therefore 180(6-2) / 6 = 180 x 4 / 6 = 720 / 6 = 120.
and EXTERIOR angles is 360 divided by n, therefore 360/6 = 60.
        
                    
             
        
        
        
Answer:
option A 
Step-by-step explanation:

 
        
             
        
        
        
Answer:
-b=11
Step-by-step explanation:
 Nothing else is equal to a number except its self