GOO
Given: ABCD is a parallelogram.
Prove: ZA 2C and ZBZD
By the definition of a , AD // BC and AB / DC.
Using, AD as a transversal, ZA and 2 are same-
side interior angles, so they are
Using side as a transversal, ZB and ZC are
same-side interior angles, so they are supplementary.
Using AB as a transversal, ZA and ZB are same-side
interior angles, so they are supplementary.
Therefore, ZA is congruent to 2C because they are
supplements of the same angle. Similarly, ZB is
congruent to
Done
1) Intro