Classical Geometry on the Web % Euclidean Geometry http://en.wikipedia.org/wiki/Euclidean_geometry http://mathworld.wolfram.com/EuclideanGeometry.html % Euclid's Elements http://aleph0.clarku.edu/~djoyce/java/elements/toc.html http://www.euclides.org/ % Spherical Geometry http://en.wikipedia.org/wiki/Spherical_geometry http://en.wikipedia.org/wiki/Elliptic_geometry http://mathworld.wolfram.com/EllipticGeometry.html % Affine geometry http://en.wikipedia.org/wiki/Affine_geometry http://mathworld.wolfram.com/AffineGeometry.html % Projective Geometry http://en.wikipedia.org/wiki/Projective_Geometry http://mathworld.wolfram.com/ProjectiveGeometry.html % Inversive Geometry http://en.wikipedia.org/wiki/Inversive_geometry http://mathworld.wolfram.com/InversiveGeometry.html % Non-Euclidean geometry http://en.wikipedia.org/wiki/Non-Euclidean_geometry http://en.wikipedia.org/wiki/Hyperbolic_Geometry http://mathworld.wolfram.com/topics/Non-EuclideanGeometry.html http://mathworld.wolfram.com/HyperbolicGeometry.html % Absolute geometry http://en.wikipedia.org/wiki/Absolute_geometry http://mathworld.wolfram.com/AbsoluteGeometry.html % Parallel Postulate http://en.wikipedia.org/wiki/Parallel_Postulate http://mathworld.wolfram.com/ParallelPostulate.html ================================================================