Option D is the correct answer. 
Answer:
D. ∠B and ∠C are congruent.
Step-by-step explanation:
Since, ∠A and ∠B are supplementary. 
Therefore, 
∠A + ∠B = 180°.....(1)
Since, ∠A and ∠C are supplementary. 
Therefore, 
∠A + ∠C = 180°.....(2)
From equations (1) & (2)
∠A + ∠B = ∠A + ∠C
=> ∠B = ∠C
Hence, ∠B and ∠C are congruent.
 
        
             
        
        
        
Answer: 
1060000
Step-by-step explanation:
 just calculation does the job
 
        
                    
             
        
        
        
Answer:
4/5 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
<h3>r =-12</h3>
Step-by-step explanation:
