Euclid's Elements Book 1: Proposition 29, Parallel Lines Converse

This is the twenty ninth proposition in Euclid's first book of The Elements. This proof is the converse to the last two propositions on parallel lines. It essentially shows that if two lines are parallel, the alternate angles are equal, the exterior angle is equal to the interior opposite angle, and the interior angles on the same side add up to two right angles.

[@jakesummers2823]

You are the reason I'm not failing math class, thank you kind sir

[@marcosbisso7136]

same here

[@charlietittmann575]

Bro same

[@julia4jewels477]

You have helped me so much with the first half of college geometry- thank you!

[@EulersAcademy]

Thanks for watching. I'm glad to hear that the videos have been helpful.

[@anonymouscustomer7781]

How can you do CN 2 when you assume the the angles aren’t equal . Like if it’s equals added to equals but those angles aren’t equal why is that ok to use