i13-adjacent-angles-are-congruent-to-the-sum-of-two-right-angles-proof

Learn this proposition with interactive step-by-step here:

http://pythagoreanmath.com/euclids-elements-book-1-proposition-13/

Buy my app!

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

visit my site:

http://www.pythagoreanmath.com

In proposition 13, of Euclid's Elements, we prove that with any two straight lines that touch or cross the adjacent angles are always congruent to the sum of two right angles.

Playlist of Euclid's Elements in link below:

http://www.youtube.com/playlist?list=PLFC65BA76F7142E9D

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Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

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