 Geometry Activities - http://homepage.mac.com/efithian/geometry.html By Ephraim Fithian. |
 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. |
 A New Way to Calculate a Triangle's Area - http://hometown.aol.com/tienchien/myhomepage/find_triangle_area.html Using the length of the three sides. The proof is better understood than the old one. |
 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. |
 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. |
 NPR : Mathematicians Get Crafty with Geometry - http://www.npr.org/templates/story/story.php?storyId=4531695 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] |
 Bette Veteto's Homepage - http://www.people.memphis.edu/~brveteto/ History of Mathematics, very strong on geometry. |
 The Entropy Reduction Laboratory by Karl-Dietrich Neubert - http://www.neubert.net/ Discusses double shell structured periodic systems, platonic spheres, molecular and crystal structures, and FlashSort algorithms. |
 Erich's Packing Center - http://www.stetson.edu/~efriedma/packing.html Graphics and links for various packing, tiling and covering problems. |
 Encyclopedia of Triangle Centers - http://faculty.evansville.edu/ck6/encyclopedia/ By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams. |
 The Kepler Conjecture - http://www.math.pitt.edu/~thales/kepler98/ Information on the recent proof of Kepler conjecture on sphere packings. |
 Wilson Stothers' Inversive Geometry and CabriJava Pages - http://www.maths.gla.ac.uk/~wilson/cabripages/inversive/inversive0.html Includes Steiner's Porism and the arbelos. |
 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. |
 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. |
 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. |
 Geometry/Topology at Michigan State University - http://www.math.msu.edu/gt/ Activities of the geometry/topology group at Michigan State University. |
 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. |
 Paul Bourke's Geometry Page - http://astronomy.swin.edu.au/~pbourke/geometry/ Includes formulas, definitions and three dimensional image illustrations. |
 Problem of the Minimum Rotation Surface - http://home.ural.ru/~iagsoft/PMRS_J.html Java applet demonstrating the catenary. |
 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. |
 Math Forum: Geometry POW/POM Search - http://mathforum.org/powgrepform.html 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: Geometry.research - http://mathforum.org/kb/forum.jspa?forumID=130 Discussion board for geometry professors and instructors to keep informed of the latest research. |
 Math Forum: Search geometry-forum - http://mathforum.org/kb/forum.jspa?forumID=126 Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum. |
 Steiner Surfaces - http://www.ipfw.edu/math/Coffman/steinersurface.html Mathematical descriptions and ray-traced images of various types of Steiner surfaces. |
 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. |
 Center of Points in 2- or Higher-dimensional Space - http://www.geocities.com/kiranisingh/center.html 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. |
 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. |
 A Gallery of Interactive On-Line Geometry - http://www.geom.uiuc.edu/apps/gallery.html At the Geometry Center. |
 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. |
 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. |
 Cuboid and Cube Surface Distances - http://www.btinternet.com/~se16/js/cuboid.htm A java applet with substantial analysis related to distances on a rectangular box. |
 Geometry Page from Interactive Mathematics Miscellany - http://www.cut-the-knot.com/geometry.html Includes articles on topics in elementary and not so elementary geometry, many with interactive Java illustrations and multiple proofs. |
 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'. |
 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. |
 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. |
 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. |
 Cut the Knot - http://www.cut-the-knot.org/geometry.shtml Features articles about specific problems, illusions, and puzzles. Includes diagrams. |
 The Complete Quadrilateral - http://www.cut-the-knot.org/ctk/CompleteQuadrilateral.shtml Several properties of the complete quadrilateral illustrated with Java applets |
 The Lepidoptera of the Circles - http://www.cut-the-knot.org/ctk/Lepidoptera.shtml The Butterfly theorem and its generalizations illustrated by Java applets. |
 New Mathematical Findings by Secondary Students - http://www.javeriana.edu.co/universitas_scientiarum/vol6n2/ART1.htm High school students solve complex geometric problems by using GLad Sketchpad. Page includes diagrams. |
 Polyedergarten - http://www.polyedergarten.de Shows paper models of polyhedra. |
 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. |
 Mathematical Curves and Surfaces - http://pagesperso-orange.fr/roger.assouly/ Graphical representations of computer generated forms. (French/English). |
 Math 3210 - Higher Geometry I - http://www-math.cudenver.edu/~wcherowi/courses/m3210/m3210.html Course notes by Bill Cherowitzo. |
 Packomania - http://hydra.nat.uni-magdeburg.de/packing/packing.html Includes packings of equal objects in containers together with source codes to obtain them numerically. |