Gavin Valencia

Geography

13 September, 14:56

By the definition of a, AD / BC and AB / DC.

Using, AD as a transversal, ZA and are same-

side interior angles, so they are

Using side as a transversal, ZB and Care

same-side interior angles, so they are supplementary.

Using AB as a transversal, ZA and B are same-side

interior angles, so they are supplementary.

Therefore, ZA is congruent to ZC because they are

supplements of the same angle. Similarly, ZB is

congruent to Z