| A Gallery of Interactive On-Line Geometry: At the Geometry Center. |
| A New Way to Calculate a Triangle's Area: Using the length of the three sides. The proof is better understood than the old one. |
| Archimedes' Book of Lemmas: A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration. |
| Bette Veteto's Homepage: History of Mathematics, very strong on geometry. |
| Bob's Pages: A collection of interactive geometry applets. Topics include polyhedra, Poncelet's porism, Soddy's hexlet, Mandelbrot set, Steiner porism, Pappus's chain, Repulsion polyhedra and stereo pictures. |
| Center of Points in 2- or Higher-dimensional Space: It provides important formulations for finding a center of points in 2 or higher dimensional space. It can be used in drawing delauney triagulation and voronoi diagram in two or higher dimensions. It also describes how many points are required in defining a center in n-dimensional space. |
| Conjectures Produced by the Program Graffiti: Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography. |
| Cuboid and Cube Surface Distances: A java applet with substantial analysis related to distances on a rectangular box. |
| Cut the Knot: Features articles about specific problems, illusions, and puzzles. Includes diagrams. |
| Encyclopedia of Triangle Centers: By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams. |
| Erich's Packing Center: Graphics and links for various packing, tiling and covering problems. |
| Fundamentals of Geometry: Free online book on geometry in pdf format. Contains material not easily found elsewhere from detailed exposition of elementary absolute geometry based on Hilbert's axioms to more advanced topics. |
| Geometric Group Theory: Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links. |
| Geometry Activities: By Ephraim Fithian. |
| Geometry and the Imagination in Minneapolis: Geometry exercises for a two-week summer workshop led by John Conway, Peter Doyle, Jane Gilman and Bill Thurston at the Geometry Center in Minneapolis, June 1991. |
| Geometry Center: Web site for the (now closed) Center for the Computation and Visualization of Geometric Structures at the University of Minnesota. Graphics, multimedia, software, teaching resources. |
| Geometry Formulas and Facts: Excerpts from the 30th Edition of the CRC Standard Mathematical Tables and Formulas (1995), namely, the geometry section minus differential geometry. |
| Geometry from the Land of the Incas: Presents problems involving circles and triangles, with proofs, SAT practice quizzes and famous quotes. Also, has examples of geometry in Peruvian culture. |
| Geometry in Action: Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications. |
| Geometry Page from Interactive Mathematics Miscellany: Includes articles on topics in elementary and not so elementary geometry, many with interactive Java illustrations and multiple proofs. |
| GLaD Comments: A new type of geometric construction that was discovered by Dan Litchfield and David Goldenheim. Includes general explanation and sketch examples. |
| Math 3210 - Higher Geometry I: Course notes by Bill Cherowitzo. |
| Math Forum: Geometry POW/POM Search: Search the Geometry Problem of the Week's archive of creative, non-routine challenges, as well as submissions and commentary, dating back to 1993. |
| Math Forum: Geometry.research: Discussion board for geometry professors and instructors to keep informed of the latest research. |
| Math Forum: Search geometry-forum: Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum. |
| Mathematical Curves and Surfaces: Graphical representations of computer generated forms. (French/English). |
| Morley's Miracle: A discussion of Morley's famous theorem and the research of which it was a tiny part. 5 proofs are given including J. Conway's, D. Newman's, and A. Connes'. |
| New Mathematical Findings by Secondary Students: High school students solve complex geometric problems by using GLad Sketchpad. Page includes diagrams. |
| NPR : Mathematicians Get Crafty with Geometry: A husband and wife from Cornell University have come up with a crafty way to illustrate high-level geometry concepts -- by manipulating yarn into models that help explain the curvature of spaces. The mathemeticians talk with NPR's Jacki Lyden about hyperbolic crocheting. [4:47 streaming audio broadcast] |
| Packomania: Includes packings of equal objects in containers together with source codes to obtain them numerically. |
| Paul Bourke's Geometry Page: Includes formulas, definitions and three dimensional image illustrations. |
| Problem of the Minimum Rotation Surface: Java applet demonstrating the catenary. |
| Steiner Surfaces: Mathematical descriptions and ray-traced images of various types of Steiner surfaces |
| The Complete Quadrilateral: Several properties of the complete quadrilateral illustrated with Java applets |
| The Entropy Reduction Laboratory by Karl-Dietrich Neubert: Discusses double shell structured periodic systems, platonic spheres, molecular and crystal structures, and FlashSort algorithms. |
| The Geometry Junkyard: Usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry. |
| The Kepler Conjecture: Information on the recent proof of Kepler conjecture on sphere packings. |
| The Lepidoptera of the Circles: The Butterfly theorem and its generalizations illustrated by Java applets. |
| Tim Lister's Hyperbolic Geometry: Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model. |
| Wilson Stothers' Inversive Geometry and CabriJava Pages: Includes Steiner's Porism and the arbelos. |
| Xah's Personal Page: Features an illustrated dictionary of special plane curves, a paper on wallpaper groups, mathematics image gallery and links to software packages. |
Classical
