# Geometry

- 1
- A Gallery of Interactive On-Line Geometry
- Page http://www.geom.uiuc.edu/apps/gallery.html
- At the Geometry Center.

- 2
- Archimedes' Book of Lemmas
- Page 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.

- 3
- Bette Veteto's Homepage
- Page http://umdrive.memphis.edu/brveteto/www/
- History of Mathematics, very strong on geometry.

- 4
- Bob's Pages
- Page 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.

- 5
- Conjectures Produced by the Program Graffiti
- Page 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.

- 6
- Cut the Knot
- Page http://www.cut-the-knot.org/geometry.shtml
- Features articles about specific problems, illusions, and puzzles. Includes diagrams.

- 7
- Encyclopedia of Triangle Centers
- Page http://faculty.evansville.edu/ck6/encyclopedia/
- By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.

- 8
- Fundamentals of Geometry
- Page 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.

- 9
- GLaD Comments
- Page 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.

- 10
- Geometric Group Theory
- Page http://www.math.ucsb.edu/~jon.mccammond/geogrouptheory/
- Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.

- 11
- Geometry Center
- Page 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.

- 12
- Geometry Formulas and Facts
- Page 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.

- 13
- Geometry and the Imagination in Minneapolis
- Page 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.

- 14
- Geometry from the Land of the Incas
- Page 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.

- 15
- Geometry in Action
- Page 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.

- 16
- Geometry/Topology at Michigan State University
- Page http://www.math.msu.edu/gt/
- Activities of the geometry/topology group at Michigan State University.

- 17
- Go Geometry
- Page 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.

- 18
- Math Forum: Geometry.research
- Page http://mathforum.org/kb/forum.jspa?forumID=130
- Discussion board for geometry professors and instructors to keep informed of the latest research.