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Top 20 Directory:
Top : Science : Math : Geometry : Non-Euclidean
Sites:
  		• Book List on Non-Euclidean Geometry: From theTreasureTroves collection.
  		• Euclidean and Non-Euclidean Geometry with The Geometer's Sketchpad: Conference talk by Scott Steketee with downloadable sketches.
  		• Minkowskian geometry and quaternion algebras: An exploration of the geometry of quaternion algebra, including a commutative variant which exhibits the properties of Minkowskian geometry.
  		• Non-Euclidean Geometry: A historical account with links to biographies of some of the people involved.
  		• Non-Euclidean Geometry - Mathematics and the Liberal Arts: A resource for student research projects and for teachers interested in using the history of mathematics in their courses.
  		• Non-Euclidean Geometry with LOGO: Review of a new version of LOGO developed at Cardiff.
  		• NonEuclid - Hyperbolic Geometry Article + Software Applet: NonEuclid is a software simulation offering straightedge and compass constructions in hyperbolic geometry.
  		• References for Non-Euclidean Geometry: A bibliographic reference list of books and articles on non-Euclidean geometries, part of the MacTutor History of Mathematics archive.
  		• Seminar on the History of Hyperbolic Geometry: Seminar notes by Greg Schreiber.
  		• Spherical Trigonometry, Arc Distance Formula: Finding the shortest distance between two points on the earth given latitude and longitude. Download ARC_CALC_3, Microsoft Excel version, A Spherical Triangle Calculator by James Q. Jacobs.
  		• The Ontology and Cosmology of Non-Euclidean Geometry: A philosophical essay.
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