Here are four draft chapters for the Post-Euclidean Geometry project. They may be useful as adjunct literature for students and teachers of non-Euclidean geometry courses. These notes are the copyrighted property of the author and should not be copied or distributed for commercial purposes.

For students of Math 302, Fall 2003: please note that these readings should be used for background reading and possible elucidation of obscure topics. They are not part of the core curriculum for your edition of the course.

Chapter 1 Axiomatic Systems for Geometry
Chapter 2 The Beltrami-Klein Model of the Hyperbolic Plane
, incomplete. Chapter 3 The Poincar\'e Models of the Hyperbolic Plane
Chapter 4 Lesson on Area and Gauss' Theorem