Answer:
= means "is congruent to"
Statement (Reason)
1) AB = DC (given)
2) AD = BC (given)
3) AC = AC (Reflexive Property)
4) ∆ABC = ∆DCA (SSS)
5) Angle 1 = Angle 2 (CPCTC)
6) AB || DC (parallel lines form congruent alternate interior angles)
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