Question

Can someone please help me with this question

Answer 1

It seems the first line has to be

1. AB=CD and AD=CB   1. given

2. AC=AC   2. Reflexivity (things are equal to themselves)

3  $\triangle$ ACB $\cong$ $\triangle$ CAD      3. SSS

4.  $\angle$  1 =   $\angle$  4.  Corresponding parts of congruent triangles

5  DC || AB                 5.  Congruent alternate traversal angles imply parallel lines