Geometry
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- Archimedes' Book of Lemmas
- A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration.
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- Bob's Pages
- 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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- Conjectures Produced by the Program Graffiti
- Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography.
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- Encyclopedia of Triangle Centers
- By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.
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- Fundamentals of Geometry
- 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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- GLaD Comments
- 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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- Geometric Group Theory
- Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
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- Geometry Center
- 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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- Geometry Formulas and Facts
- 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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- Geometry and the Imagination in Minneapolis
- 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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- Geometry from the Land of the Incas
- 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 in Action
- Includes collections from various areas in which ideas from discrete and computational geometry meet real world applications.
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- Geometry/Topology at Michigan State University
- Activities of the geometry/topology group at Michigan State University.
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- Go Geometry
- 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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- Math Forum: Search geometry-forum
- Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum.