Answer:
for the first blank, it is the given, so it would be PARALLELOGRAM ABCD. For the second blank, it is equal to itself, so it would be REFLEXIVE PROPERTY. For the fourth blank, i believe it would be the alternate int. angles thm. And lastly the 5th blank would be what you're proving, which is triangle ADC is congruent to triangle CBA.
Step-by-step explanation:
