- Allexperts Geometry Q&A
- Volunteer tutors help you work through your geometry problems for free.
- ArXiv Front: MG Metric Geometry
- Metric geometry section of the mathematics e-print arXiv.
- Bette Veteto's Homepage
- History of Mathematics, very strong on geometry.
- Colin and Greg's Golden Ratio Page
- This is an informative site on an interesting aspect of Geometry: The Golden Ratio.
- Cuboid and Cube Surface Distances
- A java applet with substantial analysis related to distances on a rectangular box.
- 2D Curves
- 2-dimensional mathematical curves.
- Dearing Aviation
- Describes solutions of Apollonius' Problem in two and three dimensions.
- 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.
- Erich's Combinatorial Geometry Page
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- Erich's Packing Center
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- e-zgeometry
- An interactive geometry site for high school teachers and students with an interactive textbook, class video clips, geometry projects, geometry glossary, and resources.
- Fibonacci Numbers and the Golden Section
- This is the Home page for the Fibonacci numbers, the Golden section and the Golden string. Department of Computing School of Electronic Engineering, IT and Mathematics, University of Surrey, UK.
- The Fundamental Theorem of Projective Geometry
- Maska Law.
- A Gallery of Interactive On-Line Geometry
- At the Geometry Center.
- Geometric Group Theory
- Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
- Geometry Center
- Center for the Computation and Visualization of Geometric Structures, at the University of Minnesota.
- The Geometry Center
- From the University of Minnesota.
- 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.
- The Geometry Forum
- An electronic community focused on geometry and math education based at Swarthmore college.
- Geometry Homework Help
- GeometryHomework.com offers homework help and online tutorials for grades 7-12 with detailed lessons, quizzes, interactive tests and solved problems.
- Geometry in Action
- This page collects various areas in which ideas from discrete and computational geometry meet some real world applications.
- 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 Geometry of the Sphere
- This material was the text for part of the Advanced Mathematics course in the High School Teachers Program at the IAS/Park City Mathematics Institute at the Institute for Advanced Study during July of 1996.
- Geometry Page from Interactive Mathematics Miscellany
- More than 120 articles on topics in elementary and not so elementary geometry, many with interactive Java illustrations and multiple proofs.
- GeomNet
- Family of geometric computing servers execute a variety of geometric algorithms on behalf of remote clients, which can be either users interacting through a Web browser interface or application programs connecting directly through sockets.
- GLaD: Introduction
- A historical introduction to a new Euclidean construction by David Goldenheim and Daniel Litchfield. Dynamic Geometer's Sketchpad files are included.
- Important Concepts from Projective Geometry
- Webtext by Paul Beardsley.
- Intensified Geometry Curriculum Review
- A comprehensive, illustrated review of concepts covered in an Intensified Geometry textbook/class.
- The Kepler Conjecture
- A great source of information on the recent proof of Kepler conjecture about sphere packings.
- Lecture Notes on Projective Geometry
- By Balázs Csikós. Budapest Semesters in Mathematics. In DVI format.
- Manipula Math with Java
- Java applets demonstrating many geometrical and other theorems
- 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: Search geometry-forum
- Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum
- Math Forum: Search geometry-research
- Geometry professors and instructors may keep informed of the latest research conducted in their field at the geometry-research discussion list.
- The Math Forum's K-12 Geometry
- Select classroom materials for geometry teachers and students, software for geometry, interactive geometry classroom resources, Internet projects, selected geometry elsewhere on the Internet, and public forums for discussing geometry.
- Mathematical Surfaces
- A collection of parametric and implicit equations.
- On the Fourth Dimension
- Concepts of the fourth dimension explained simply
- Open Problems
- Collected by Jeff Erickson. Mainly in geometry.
- Open Problems from the Geometry Junkyard
- Complied by David Eppstein (University of California at Irvine).
- Open Problems in Discrete and Computational Geometry
- Compiled by Jorge Urrutia.
- Packomania
- This site collects the best known packings of equal objects in containers together with source codes to obtain them numerically.
- Problem of the Minimum Rotation Surface
- Java applet demonstrating the catenary.
- Projective Geometry
- Rudolf Steiner's approach.
- Projective Geometry for Multiple View Analysis
- A new framework for studying the problems of camera calibration, motion determination, and 3D structure reconstruction in the most general case of totally uncalibrated views.
- Sacred Geometry Home Page
- Sacred geometry is an ancient art and science which reveals the nature of our relationship to the cosmos; it leads to the perspective of interconnectedness, inseparability and relatedness.
- Steiner Surfaces
- Mathematical descriptions and ray-traced images of every type of Steiner surface
- Steiner Trees
- Open Problems with Steiner Trees.
- Tim Lister's Hyperbolic Geometry
- Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model.
- Wallpaper Groups
- Images and descriptions of the 17 plane symmetry groups.
- Wilson Stothers' Cabri and Conics Pages
- A site devoted to (mainly projective geometry) illustrated by Cabri II and CabriJava.
- Wilson Stothers' Inversive Geometry and CabriJava Pages
- A page on inversive geometry with CabriJava illustrations. Includes Steiner's Porism and the arbelos.
- Xah: Visual Dictionary of Special Plane Curves
- A Visual Dictionary of Special Plane Curves with graphics.
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