Answer:
the first one A the sum of the angles are 10x+10 For the second one B the sum wud be 8x+20
Step-by-step explanation:
you juts add them all together 
 
        
                    
             
        
        
        
6578 i don’t know don’t ask me bit
        
             
        
        
        
Answer:
Yes, this is a right triangle
Step-by-step explanation:
Plug the values into the pythagorean thm. 
1.5^2 + 2^2 = 2.5^2
2.25+4=6.25
6.25=6.25