Euclid's Approach to Parallel Lines
Topics in Euclid's Approach to Parallel Lines
Numbered in the order to learn them.
Euclid's Parallel Postulate
Euclid's Foundations: The Exterior Angle Inequality Theorem
Euclid's Foundations: Congruent Angles Imply Parallel Lines, Proof by Contradiction
Euclid's Proof of AAS
Euclid's Foundations: Equivalents of the Parallel Postulate
Euclid's Foundations: Parallel Lines Imply Congruent Angles, Proof by Contradiction
Euclid's Foundations: Constructing a Parallel Line
Euclid's Foundations: Proving the Sum of Angles in a Triangle