a=180-117=63
b=180-81-63=36
so angle a is 63, and angle b is 36
please mark brainliest
 
        
                    
             
        
        
        
Answer:
it is c I think if not sorry
 
        
                    
             
        
        
        
Answer:
D. 420
The area of a triangle is 

 half of(base× height)
10×16= 160
160÷2=80
That is the surface area of ONE triangle. 
multiply 80 by 4 to get 320
then find the surface area of the square by doing length×width to get 100
Finally add them together
320+100=420