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Selected Internet Geometry Sites
 Corner for Interactive Geometry Software (CIGS)
 The Math Forum

The main Math Forum page for resources devoted to the support of teaching with geometry software, especially dynamic, interactive software such as
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 Discussions
 Math Forum

The Math Forum's discussions include mathematics and math educationrelated newsgroups, mailing lists, and Webbased discussions. Read recent and
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 Erich's Packing Center
 Erich Friedman

A huge collection of packing problems, each explained with graphics. 2D examples include Triangles in Squares, Circles in Squares, Squares in Squares,
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 Gallery of Interactive OnLine Geometry
 The Geometry Center

Twelve interactive online geometry programs: WebPisces (compute implicitly defined curves in the plane); Build a Rainbow (a lab that examines a
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 Geometry and the Imagination
 Conway, Doyle, Gilman, Thurston; The Geometry Center

A collection of handouts for a twoweek summer workshop entitled 'Geometry and the Imagination', led by John Conway, Peter Doyle, Jane Gilman and Bill
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 The Geometry Center
 University of Minnesota

The Center for the Computation and Visualization of Geometric Structures: an NSF Science and Technology Research Center. The Center has a unified
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 Geometry In Action
 David Eppstein, Theory Group, ICS, UC Irvine

A collection of applications of computational geometry: areas in which ideas from discrete and computational geometry (meaning mainly lowdimensional
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 The Geometry Junkyard
 David Eppstein, Theory Group, ICS, Univ. of California at Irvine

A collection of usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to
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 Math Lessons
 Cynthia Lanius

A variety of algebraic and geometric projects and puzzles that help students find mathematical patterns and formulas. The Million $ Mission explores
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 NonEuclid
 Joel Castellanos, Joe Dan Austin, Ervan Darnell

A Java program offering straightedge and compass constructions in hyperbolic geometry for high school and college students. A compressed version for
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 Pavilion of Polyhedreality
 George W. Hart

A page of images of polyhedra from the author of Multidimensional Analysis and the Encyclopedia of Polyhedra. Constructions from wood, paper, paper
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 Preuve Proof Prueba

A newsletter in French, Spanish, and English, the theme of which is teaching and learning mathematical proofs. Includes an extensive bibliography
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 Topology and Geometry Software: Fun and Games
 Jeff Weeks

Fun math toys for all ages, from the author of Exploring the Shape of Space (grades 610) and The Shape of Space (grades 1216). Applets and software
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 Triangle Centers
 Clark Kimberling; Dept. of Mathematics, Univ. of Evansville, Evansville, IN

A listing, with description and illustration, of 20thcentury triangle centers (including: Schiffler Point, Exeter Point, Parry Point, congruent
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 Virtual Polyhedra
 George W. Hart

A growing collection of over 1000 virtual reality polyhedra to explore, complementing Hart's Pavilion of Polyhedreality. Includes instructions for
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 A Visual Dictionary of Special Plane Curves
 Xah Lee

Materials that demonstrate interesting properties of plane curves visually. Many concepts or properties of plane curves, such as cusp, tangent,
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 For more, search or browse Geometry in the Forum's Internet Mathematics Library.
