Lecture 13
We continued discussing Book I of Euclid's Elements with our ultimate goal of proving the Pythagorean Theorem.
In particular we went over the proofs of the following Propositions:
Proposition 4
(SAS = side angle side)
Proposition 5
(Thales' Theorem - or - "pons asinorum")
Proposition 13
Proposition 15
Proposition 16
Click on the above links to go directly to the proofs and commentaries of the results.