The video clips below are portions of the lecture given by Prof. Jim Colliander to the grades 10, 11 and 12 students in the Enriched Math program at Albert Campbell Collegiate Institute.
(sound quality is not so good... you probably need to use earphones to clearly hear the lecture)
The Greeks: The Irrationality of the Square Root of 2
Islam: Omar Khayam's Algebraic Proof of the Pythagorean Theorem....clip 1
Islam: Omar Khayam's Algebraic Proof of the Pythagorean Theorem...clip 2