A pair of supplementary angles are_____________. 
A. A and B
B. B and D
C. C and E
                                             
                                          
                                          
                                        
											 
											A pair of supplementary angles are C and E. We know that B, D, and E are all congruent, and can see that both C and B, and C and D would form supplementary angles. So, we can also use E to form supplementary angles.
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