Alright, lets get started.
If the polygon measures 45 degree exterior angle and we are asked to find number of sides, there is a formula for that.
 = value of exterior angle
 = value of exterior angle
Where n is number of sides of ploygon

Multiplying n into both sides


Now divide 45 in both sides

n = 8
Means number of sides of polygon is 8, hence its Octagon. Answer
Now we have given 45 exterior angle hence interior angle would be 
180 - 45 = 135°
So, sum of all interior angles would be = number of sides * interior angle
sum of all interior angles would be = 
Hence sum of all interior angles would be 1080°. Answer
Hope it will help :)
 
        
             
        
        
        
Answer:
57
Step-by-step explanation:
10+19+11+17=?
29+11+17=?
40+17=?
57
 
        
                    
             
        
        
        
The answer is the second one
        
                    
             
        
        
        
30+8*3=114 2y-6=56.... I think your answer would be 170 but I'm not completely sure