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Geometry Center - http://www.geom.uiuc.edu/
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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A Gallery of Interactive On-Line Geometry - http://www.geom.uiuc.edu/apps/gallery.html
At the Geometry Center. |
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Geometry in Action - http://www.ics.uci.edu/~eppstein/geom.html
Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications. |
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The Geometry Junkyard - http://www.ics.uci.edu/~eppstein/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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Encyclopedia of Triangle Centers - http://faculty.evansville.edu/ck6/encyclopedia/
By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams. |
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Geometry from the Land of the Incas - http://agutie.homestead.com/
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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Geometry Formulas and Facts - http://www.geom.uiuc.edu/docs/reference/CRC-formulas/
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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Xah's Personal Page - http://xahlee.org/PageTwo_dir/more.html
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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Geometry and the Imagination in Minneapolis - http://www.geom.uiuc.edu/docs/doyle/mpls/handouts/handouts.html
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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Paul Bourke's Geometry Page - http://astronomy.swin.edu.au/~pbourke/geometry/
Includes formulas, definitions and three dimensional image illustrations. |
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Math Forum: Geometry.research - http://mathforum.org/kb/forum.jspa?forumID=130
Discussion board for geometry professors and instructors to keep informed of the latest research. |
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Sangaku: Reflections on the Phenomenon - http://www.cut-the-knot.org/pythagoras/Sangaku.shtml
Critical reflections on the sangaku phenomenon accompanied by a collection of solved sangaku problems, many with interactive Java illustrations. |
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Morley's Miracle - http://www.cut-the-knot.com/triangle/Morley/index.html
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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Tim Lister's Hyperbolic Geometry - http://mcs.open.ac.uk/tcl2/nonE/nonE.html
Cabri constructions for the demonstration of the basic concepts of hyperbolic geometry in the Poincare disc model. |
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Archimedes' Book of Lemmas - http://www.cut-the-knot.org/Curriculum/Geometry/BookOfLemmas/index.shtml
A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration. |
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Fundamentals of Geometry - http://polly.phys.msu.ru/~belyaev/geometry.htm
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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Go Geometry - http://www.gogeometry.com
Offers a variety of resources for teaching and learning about geometry. Problems and theorems are presented with step-by-step solutions for each proof. |
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Geometry Activities - http://homepage.mac.com/efithian/geometry.html
By Ephraim Fithian. |
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Geometric Group Theory - http://www.math.ucsb.edu/~jon.mccammond/geogrouptheory/
Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links. |
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GLaD Comments - http://jwilson.coe.uga.edu/Texts.Folder/GLaD/GLaD.Comments.html
A new type of geometric construction that was discovered by Dan Litchfield and David Goldenheim. Includes general explanation and sketch examples. |
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Bob's Pages - http://members.ozemail.com.au/~llan/
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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The Complete Quadrilateral - http://www.cut-the-knot.org/ctk/CompleteQuadrilateral.shtml
Several properties of the complete quadrilateral illustrated with Java applets |
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The Lepidoptera of the Circles - http://www.cut-the-knot.org/ctk/Lepidoptera.shtml
The Butterfly theorem and its generalizations illustrated by Java applets. |
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Conjectures Produced by the Program Graffiti - http://cms.dt.uh.edu/faculty/delavinae/research/wowref.htm
Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography. |
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Bette Veteto's Homepage - http://www.people.memphis.edu/~brveteto/
History of Mathematics, very strong on geometry. |