Justify the last two steps of the proof.
Given: ABCD is a parallelogram
Prove: ABC = CDA
1. ABCD is a parallelogram. 1. Given
2. AB = DC and BC = DA 2. Opposite sides of a parallelogram are congruent
3. AC = Ca 3. Blank
4. ABC = CDA 4. Blank
Transitive Property of =: SAS
Reflexive Property of =: SAS
Transitive Property of =: SSS
Reflexive Property of =: SSS
3. AC = DC (opposite sides of a parallelogram are congruent)
4. ABC = CDA (Transitive Property of =: SAS)
The last two steps of the proof are justified by the Transitive Property of =: SAS and the Opposite Sides of a Parallelogram are Congruent.