Mathematics, 18.05.2021 23:00 1315055427

In the figure, AB || DC and AD || BC. To prove that AB = CD, one must first show that AABC-ACDA.
Which theorem or postulate can be used to justify AABC - ACDA?

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In the figure, AB || DC and AD || BC. To prove that AB = CD, one must first show that AABC-ACDA.