In class we proved that one pair of parallel sides in a parallelogram must be congruent. Add to your proof to prove that both pairs of parallel sides in a parallelogram must be congruent.[br][br]You may use the GeoGebra app above to illustrate your proof.
IM G Unit 2 Lesson 7 from IM Geometry by Illustrative Mathematics, [url=https://im.kendallhunt.com/HS/students/2/2/1/index.html]https://im.kendallhunt.com/HS/students/2/2/7/index.html[/url]. Licensed under the Creative Commons Attribution 4.0 license, [url=https://creativecommons.org/licenses/by/4.0/]https://creativecommons.org/licenses/by/4.0/[/url].