In this YouTube video, Linda Perry - a former math teacher - uses the power of Origami to demonstrate the Pythagorean Theorem.

https://www.youtube.com/watch?v=ncNt15SNlZE

This Youtube video presents an origami proof of the Pythagorean Theorem.

http://www.youtube.com/watch?v=ncNt15SNlZE

This site, developed by Wolfram Math World, presents extensive resources for the study of Geometry.

http://mathworld.wolfram.com/topics/Geometry.html

This article discusses new research showing that the Pythagorean Theorem was discovered 1,000 years earlier than previously thought.

http://blossoms.mit.edu/user/reset/7/1503657611/0t-ZO8LtTDlbLBCqKXEKGA5bRss

This Khan Academy site presents extensive resources for learning about the Pythagorean Theorem.

https://www.khanacademy.org/math/geometry/triangles/v/introduction-to-the-pythagorean-theorem

These two sites are preparatory sites for the New York State Regents exam. In addition to example problems, these sites explore the Pythagorean Theorem’s relation to the Distance Formula and to the Law of Cosines

http://www.regentsprep.org/Regents/math/ALGEBRA/AT1/Pythag.htm

http://www.regentsprep.org/Regents/math/geometry/GP13/indexGP13.htm

"Words and Pictures: New Light on Plimpton 322," (2002) by Eleanor Robson. This paper explores the historical mathematical artifact, Plimpton 322.

http://www.maa.org/news/monthly105-120.pdf

Eleanor Robson, “Neither Sherlock Holmes nor Babylon: A Reassessment of Plimpton 322”, published in /Historia Mathematica,/ Vol 28, pages 167 - 206, 2001

http://www.academia.edu/1261668/Neither_Sherlock_Holmes_nor_Babylon_a_reassessment_of_Plimpton_322