In all triangles, inner angles add to 180 degrees.
In an isosceles triangle, the base angles are the same and the vertex angle is different from the rest.
b= (180-40)/2
b= 140/2
b=70
Final answer: 70 degrees
        
             
        
        
        
Answer:
Step-by-step explanation:
Part A= 59.11
Part B: i think is B 
I hope this helps :))
 
        
                    
             
        
        
        
Answer:x=3
Step-by-step explanation:
Equation:
5x+2=17
5x=15
x=3