Question

Complete the following 2-column proof.

Answer 1

While this other answer is correct, their last answer for column four is incorrect.
The answer should go like this:
1. Given
3. Reflexive property of congruence
4. SAS (side-angle-side) postulate

Answer 2

Here is one possible way to complete the proof:

Statement Reason
AB = CD Given
AC = AC Reflexive Property of Equality
Triangle ABC = Triangle CDA SAS Postulate
ABC = CDA Corresponding Parts of Congruent Triangles are Congruent