| Problem of the Minimum Rotation Surface - Java applet demonstrating the catenary.
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| Geometry in Action - Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications.
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| The Geometry Junkyard - 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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| Erich's Packing Center - Graphics and links for various packing, tiling and covering problems.
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| Tim Lister's Hyperbolic Geometry - Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model.
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| Bette Veteto's Homepage - History of Mathematics, very strong on geometry.
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| Steiner Surfaces - Mathematical descriptions and ray-traced images of various types of Steiner surfaces
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| Mathematical Surfaces - A collection of parametric and implicit equations.
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| 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.
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| Wilson Stothers' Inversive Geometry and CabriJava Pages - Includes Steiner's Porism and the arbelos.
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| Allexperts Geometry Q&A - Volunteer tutors help you work through your geometry problems for free.
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| Diamond Theory - Plato tells how Socrates helped Meno's slave boy "remember" the geometry of a diamond. Twenty-four centuries later, this geometry has a new theorem.
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| Packomania - Includes packings of equal objects in containers together with source codes to obtain them numerically.
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| Math 3210 - Higher Geometry I - Course notes by Bill Cherowitzo.
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| Cuboid and Cube Surface Distances - A java applet with substantial analysis related to distances on a rectangular box.
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| 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.
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| 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'.
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| Math Forum: Search geometry-forum - Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum.
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| Geometry Activities - By Ephraim Fithian.
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| 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.
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| Paul Bourke's Geometry Page - Includes formulas, definitions and three dimensional image illustrations.
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| 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.
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| Mathematical Curves and Surfaces - Graphical representations of computer generated forms. (French/English).
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| 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.
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| The Entropy Reduction Laboratory by Karl-Dietrich Neubert - Discusses double shell structured periodic systems, platonic spheres, molecular and crystal structures, and FlashSort algorithms.
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| Conjectures Produced by the Program Graffiti - Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography.
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| Geometric Group Theory - Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
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| Encyclopedia of Triangle Centers - By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.
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| 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.
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| 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.
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| 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.
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| 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.
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| A Gallery of Interactive On-Line Geometry - At the Geometry Center.
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| The Kepler Conjecture - Information on the recent proof of Kepler conjecture on sphere packings.
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| Math Forum: geometry-research - Geometry professors and instructors may keep informed of the latest research conducted in their field at the geometry-research discussion list.
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| 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.
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| 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.
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