Look at new expanded 3rd edition:

Experiencing Geometry: Euclidean and Non-Euclidean With History

Experiencing Geometry

in Euclidean, Spherical, and Hyperbolic Spaces

An expanded and revised version of Experiencing Geometry on Plane and Sphere

Prentice-Hall. Copyright 2001.

David W. Henderson, Cornell University

with writing input from Daina Taimina

New Material (not in the text):

• Errata. Updated 25 January 2002.
• Problem 14.4. A new problem not currently in the text.
• Cinderella Interactive Examples. Updated 24 August 99
• Supplements. Updated November 2000
• Shape of Space, latest news and references.
• Expanded and updated Annotated Bibliography.

Material from the text:

• Title Pages. Updated September 2000
• Contents. Updated September 2000
• Preface. Updated September 2000
• How to Use This Book. Updated September 2000
• Message to the Reader. Updated September 2000
• Directions for Making Hyperbolic Models. Updated November 2000
• Appendix A: Euclid's Definitions, Postulates, and Common Notions

David's Home Page