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Web Pages

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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.
	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.
	A Gallery of Interactive On-Line Geometry - http://www.geom.uiuc.edu/apps/gallery.html At the Geometry Center.
	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.
	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.

	Mathematical Surfaces - http://www.uib.no/People/nfytn/mathgal.htm A collection of parametric and implicit equations.
	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.
	Erich's Packing Center - http://www.stetson.edu/~efriedma/packing.html Graphics and links for various packing, tiling and covering problems.
	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]
	Encyclopedia of Triangle Centers - http://faculty.evansville.edu/ck6/encyclopedia/ By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.

	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.
	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.
	Paul Bourke's Geometry Page - http://astronomy.swin.edu.au/~pbourke/geometry/ Includes formulas, definitions and three dimensional image illustrations.
	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.
	The Kepler Conjecture - http://www.math.pitt.edu/~thales/kepler98/ Information on the recent proof of Kepler conjecture on sphere packings.

	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.
	Steiner Surfaces - http://www.ipfw.edu/math/Coffman/steinersurface.html Mathematical descriptions and ray-traced images of various types of Steiner surfaces
	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.
	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.
	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.

	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.
	The Complete Quadrilateral - http://www.cut-the-knot.org/ctk/CompleteQuadrilateral.shtml Several properties of the complete quadrilateral illustrated with Java applets
	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.
	The Lepidoptera of the Circles - http://www.cut-the-knot.org/ctk/Lepidoptera.shtml The Butterfly theorem and its generalizations illustrated by Java applets.
	Mathematical Curves and Surfaces - http://perso.wanadoo.fr/roger.assouly/ Graphical representations of computer generated forms. (French/English).

	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.
	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.
	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'.
	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.
	Bette Veteto's Homepage - http://www.people.memphis.edu/~brveteto/ History of Mathematics, very strong on geometry.

	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.
	Geometry Activities - http://homepage.mac.com/efithian/geometry.html By Ephraim Fithian.
	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.
	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.
	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.

	Allexperts Geometry Q&A - http://www.allexperts.com/getExpert.asp?Category=2060 Volunteer tutors help you work through your geometry problems for free.
	Problem of the Minimum Rotation Surface - http://home.ural.ru/~iagsoft/PMRS_J.html Java applet demonstrating the catenary.
	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.
	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.
	Math 3210 - Higher Geometry I - http://www-math.cudenver.edu/~wcherowi/courses/m3210/m3210.html Course notes by Bill Cherowitzo.

	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.
	Area and volume formulas - http://www.turbosite.com.ar/geometricalformulas/ Provides area and volume formulas of common geometrical figures

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