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Algebraic Geometry (141)
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Open Problems (5)
People (44)
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Publications (21)
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    Science > Math > Recreations > Specific Numbers  (230)
    Kids and Teens > School Time > Math > Trigonometry  (11)

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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