Math 202 Jerry L. Kazdan

Pythagorean Theorem: Using Similar Triangles

This note is what I believe is the essence of the original proof (300 BCE?) using similar triangles -- except it has been shortened and illuminated by pruning some ingredients.

Pythagorean Theorem Using Similar Triangles (pdf)

It may be useful to compare this with other recent presentations. They involve more computation -- and led me to write this for my class.