justify the last two steps of the proof.

Given: ABCD is a parallelogram.
Prove: triangleABC = triangleCDA

1. ABDC is a parallelogram 1. given
2. AB = DC and BC =DC 2. opposite sides of a parallelogram are congruent
3. AC = CA 3. ?
4. triangleABC = triangleCDA 4.?

last two are 3 and 4. g

6 answers

hint:
http://study.com/academy/lesson/reflexive-property-of-congruence-definition-examples.html
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D. Reflexive Property of SSS
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