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At the Geometry Center.
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Using the length of the three sides. The proof is better understood than the old one.
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A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration.
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History of Mathematics, very strong on geometry.
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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.
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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.
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Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography.
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A java applet with substantial analysis related to distances on a rectangular box.
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Features articles about specific problems, illusions, and puzzles. Includes diagrams.
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By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.
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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.
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Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
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By Ephraim Fithian.
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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.
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Excerpts from the 30th Edition of the CRC Standard Mathematical Tables and Formulas (1995), namely, the geometry section minus differential geometry.
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Includes articles on topics in elementary and not so elementary geometry, many with interactive Java illustrations and multiple proofs.
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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.
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Presents problems involving circles and triangles, with proofs, SAT practice quizzes and famous quotes. Also, has examples of geometry in Peruvian culture.
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Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications.
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Course notes by Bill Cherowitzo.
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Search the Geometry Problem of the Week's archive of creative, non-routine challenges, as well as submissions and commentary, dating back to 1993.
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Discussion board for geometry professors and instructors to keep informed of the latest research.
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Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum.
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Graphical representations of computer generated forms. (French/English).
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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'.
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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]
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High school students solve complex geometric problems by using GLad Sketchpad. Page includes diagrams.
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Erich Friedman's Introduction to a variety of packing and tiling problems.
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Includes packings of equal objects in containers together with source codes to obtain them numerically.
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Java applet demonstrating the catenary.
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Features a discussion about the works of two teenagers, David Goldenheim and Daniel Litchfieldm, from Connecticut. They helped find a solution that eluded Euclid in finding a method to partition a line into any number of equal sections.
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Several properties of the complete quadrilateral illustrated with Java applets
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Discusses double shell structured periodic systems, platonic spheres, molecular and crystal structures, and FlashSort algorithms.
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Usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry.
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Information on the recent proof of Kepler conjecture on sphere packings.
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The Butterfly theorem and its generalizations illustrated by Java applets.
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Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model.
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Includes Steiner's Porism and the arbelos.
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Features an illustrated dictionary of special plane curves, a paper on wallpaper groups, mathematics image gallery and links to software packages.
