i27-lines-are-parallel-when-alternate-interior-angles-are-congruent-proof

Interactive video lesson plan for: (I.27) Lines are Parallel when Alternate Interior Angles are Congruent, Proof

Activity overview:

Learn this proposition with interactive step-by-step here:
http://pythagoreanmath.com/euclids-elements-book-1-proposition-27/

https://itunes.apple.com/us/app/euclids-elements-book-1/id717831746?ls=1&mt=8

visit my site:
http://www.pythagoreanmath.com

In proposition 27 of Euclid's Elements, we prove that if two straight lines are intersected by a third line making the alternate interior angles congruent to each other, then the two straight lines must be parallel.

Playlist of Euclid's Elements in link below:

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