(I.34) Parallelogram: opposite sides and angles are congruent, Proof

I made this with a lot of heart, and every purchase helps me keep creating. If you like what I do or just want to support independent makers, check it out: http://amazon.com/gp/product/B093D22DGN Thank you for being here—it really means a lot. Learn this proposition with interactive step-by-step here: coming soon! In proposition 34, of Book 1 of Euclid's elements, we prove that a parallelogram has the opposite sides congruent, the opposite angles congruent, and the diameter divides the parallelogram into two congruent triangles.