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 Hyperbolic Geometry (The Geometry Junkyard) - David Eppstein, Theory Group, ICS, UC Irvine An extensive annotated list of links to material in hyperbolic geometry, in which infinitely many parallels to a line can go through the same point. more>> Interactive Non-Euclidean Geometry - Carlos Criado-Cambon and Juan-Carlos Criado-Alamo Draw in Euclidean and spherical geometries -- as well as the four most popular models of hyperbolic geometry: Klein, Poincaré, half-plane, and hemisphere. This freeware lets you define points, lines, segments, and circles; analyze distances, angles, and triangle areas; and see geometric constructions in four different models at the same time. more>> Neutral and Non-Euclidean Geometries - David C. Royster; University of North Carolina at Charlotte Course notes that include: Origins of geometry; spherical geometry; logic and the axiomatic method; proof; Euclid's mathematical system; incidence geometry; betweenness axioms; congruence theorems; axioms of continuity; neutral geometry; theorems of continuity; the work of Saccheri and Gauss; hyperbolic geometry; classification of parallels; the pseudosphere; hyperbolic trigonometry and hyperbolic analytic geometry; and more. more>> NonEuclid - Joel Castellanos, Joe Dan Austin, Ervan Darnell A Java program offering straightedge and compass constructions in hyperbolic geometry for high school and college students. A compressed version for PCs may be downloaded for use offline. The site includes an introduction to hyperbolic geometry, plus activities for getting started and exploring with NonEuclid. Produced with funding from CRPC at Rice University and the Institute for Advanced Study / Park City Mathematics Institute. more>>
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