 The Geometer's Sketchpad  Ross Isenegger, Atomic Learning, Inc.
Quicktime movie tutorials to learn how to use Sketchpad. Sample "Getting Started" for free. Purchase a subscription to get tutorials on using the construction menu, using the measure menu, changing the display, coordinate geometry, transformations, creating
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 The Geometer's Sketchpad: Three Labs  Mike Riedy
Four sketches about rotation and translation, the cycloid, and the areas of a parallelogram and a triangle, with directions for making them.
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 Geometría con Cabri II  Jose Manuel Arranz
Applets para construcciones básicas, triángulos, cuadriláteros, polígonos regulares, circunferencia, movimentos en el plano, geometría en la mesa de billar, puzzles geométricos, y demostraciones de la teorema
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 Geometria Fractal Geometry  Jaume Domenech
Fractal geometry basics, including links to biographies and software, plus a collection of articles, mostly in Spanish, some in English.
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 Geometrica: a Mathematica package for Geometry  eNoteBooks Ltd.
Used by mathematics educators, researchers, and graphical designers,
Geometrica is a Mathematica application for exact drawing and geometry. With
it, you can draw points, lines, circles, ellipses, parabolas, hyperbolas,
and more, as well as determine
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 Geometrical Dimensional Analysis: Map of Physics  John Aikman
A text article and a tutorial, with references and links. Familiar equations and formulas of physics arranged into 3D structures create concept maps of the system of units and a potential for superformulas: more powerful formats for use of existing mathematical
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 Geometric Algorithms  Susan Landau; Univ. of Massachusetts at Amherst
Landau's interest in geometric algorithms has been in problems of an algebraic flavor: computeraided design, robotics, and other geometricrelated applications that have created a need for methods for embeddings, visualization, and algorithms for construction
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 Geometrical relations for Circles, Spheres, and Cylinders  Tom Solomon, Bucknell University
Diagrams and mathematical equations relating to these simple geometric shapes.
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 Geometric Arts  Ghee Beom "Quincy" Kim
A site dedicated to geometry and visual perception: patterns, fractals, structures, rotations, spirographs, optical arts, knots, and more. Some constructions include the artist's reflections, instructions, and links to related sites and interactive applets.
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 Geometric Constructions  Dave Rusin; The Mathematical Atlas
An introduction to geometric constructions using a ruler and compass. History; applications and related fields and subfields; textbooks, reference works, and tutorials; software and tables; selected topics; other web sites with this focus.
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 Geometric Constructions  G.E. Martin; SUNY at Albany, Albany, NY
A book that offers a comprehensive introduction to geometric constructions in the classical sense, combining purely mathematical, historical, and philosophical arguments and viewpoints. Contents include: Euclidean Constructions; The Ruler and Compass;
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 Geometric Construction with the Compass Alone  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Information and exercises about geometric constructions: almost everything you can do with a ruler and a compass you can do with the compass alone.
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 Geometric Loci
Pictures and animations of mathematical curiosities. Posts, which date back to January, 2014, have included Reuben Thomas iris, the trammel of Archimedes, Möbius hanger, polyhedron drilled pentagonal rotunda, and il triangulo Sierpinski secondo Dimitri.
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 Geometric Models (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material describing physical objects corresponding to geometric constructions (and methods for creating such objects), particularly polytopes.
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 Geometric Sculpture  Elias Wakan
Sculpture inspired by a love of geometric form.
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 Geometric Sculpture  George W. Hart
Geometric forms from the author of Multidimensional Analysis and the Encyclopedia of Polyhedra. As a sculptor of constructive geometric forms, Hart's work deals with patterns and relationships derived from classical ideals of balance and symmetry. He
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 Geometric Tools, Inc.  Dave Eberly
Download source code of Wild Magic RealTime 3D Graphics Engine. Geometric Tools, Inc., provides contract programming services in the areas of computer graphics, image analysis, and numerical methods.
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 Geometric Topology (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material in an area of mathematics that concerns the assignment of geometric structures to topological spaces, so
that they "look like" geometric spaces. For instance, compact twodimensional surfaces can have
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 Geometros
Makers of the CAD system SolidGraph, built on sgCore, a solidstate modeling library that allows programmers to add CAD system functionality to their programs. Read product reviews; get plugins; post to support forums and consult FAQs; see lessons, examples,
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 Geometry Algorithms  Dan Sunday, softSurfer
Resources for developing geometry algorithms and computer graphics software: overviews, histories of geometry, a gift shop, and more. The archive of algorithms includes areas of triangles and polygons; lines and distances of a point to a line; fast winding
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 Geometry and the Imagination  Conway, Doyle, Gilman, Thurston; The Geometry Center
A collection of handouts for a twoweek summer workshop entitled 'Geometry and the Imagination', led by John Conway, Peter Doyle, Jane Gilman and Bill Thurston at the Geometry Center in Minneapolis, June 1728, 1991. The workshop was based on a course
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 Geometry and Topology Journal  Mathematics Institute, University of Warwick
A fully refereed international journal, published in free electronic format and a paper version, dealing with all aspects of geometry and topology and their applications. The site offers main journal papers (in PostScript and PDF formats), research monographs,
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 Geometry and Topology: Recent Papers 19891993  Univ. of Melbourne, Australia
A bibliography of eprints from the Dept. of Mathematics and Statistics, Univ. of Melbourne, Australia.
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 geometryannouncements  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for information about lectures, announcements, special meetings, and upcoming events concerning geometry. Read and search archived messages; and register to
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 The Geometry Applet  David Joyce; Dept. of Mathematics & Computer Science, Clark University
A Java applet used to illustrate Euclid's Elements  an illustration from Euclid's Elements Book I Proposition 22. Another example using this Geometry Applet illustrates the Euler line of a triangle. Version 2.0 does threedimensional constructions, whereas
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 Geometry Basics  Jaime Garmendia III; Interactive Mathematics Online (IMO)
All the basics of geometry: Introduction; Angles and Lines; Conditionals, Unions, and Intersections; Measurement Formulas; Constructions; Greek Prefixes for polygons/polyhedra; Glossary; Sample problems; Stereograms: an Application of Geometry.
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 The Geometry Center  University of Minnesota
The Center for the Computation and Visualization of Geometric Structures: an NSF Science and Technology Research Center. The Center has a unified mathematics computing environment supporting math and computer science research, mathematical visualization,
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 geometrycollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions of topics covered in college geometry, problems appropriate for that level, and geometry education. Read and search archived messages; and
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 Geometry Daily  Tilman Zitzmann
A new "geometric minimal composition" every day since January, 2010. Zitzmann, an interaction and graphic designer, "draws simple shapes, combines them and experiments until they start to 'sing,'” then Photoshops them to have the look of "analog paper."
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 Geometry  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to geometry, including classical Euclidean geometry and synthetic (nonEuclidean) geometries; analytic geometry; incidence geometries (including projective planes); metric properties (lengths and angles);
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 Geometry Discussion Groups  Math Forum
A gateway to the archives of the Math Forum's online electronic community comprising eight geometry discussion groups for all those interested in geometry. Access current news or follow a link to threaded past discussions to browse or search the archive
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 Geometry  Elmer G. Wiens; Egwald Web Services Ltd.
A collection of interactive geometric objects represented graphically including 3Dgraphics, space curves, trigonometric functions, hyperbolic functions, and
the trajectory of projectiles.
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 Geometry Expressions  Saltire Software
A software package that allows you to interact with geometric figures numerically and symbolically. Explore classroom activities and student projects made with this interactive geometry system; read back issues of The Journal of Symbolic Geometry; purchase
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 Geometry Formulas and Facts  Silvio Levy; The Geometry Center
Rewritten and updated excerpts from the 30th Edition of the CRC Standard Mathematical Tables and Formulas. Covers all of geometry, minus differential geometry. Very complete collection of definitions, formulas, tables and diagrams, divided into two and
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 Geometry Forum Articles  The Geometry Center
Articles on mathematical topics and about the Geometry Center by the Center's mathematics writers Evelyn Sander and Bob Hesse, originally posted on newsgroups hosted by the Geometry Forum (now the Math Forum). Articles are collected under the following
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 geometryforum  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. This was the main group for the Geometry Forum, the Math Forum's previous incarnation. Not currently used. Read and search archived messages.
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 Geometry Garret  Alan H. Schoen
A "potpourri of people, pictures, places, Penrose patterns, polyhedra, polyominoes, posters, posies, and puzzles," plus finite and infinite tilings by rhombs, rosettes and pseudorosettes, rombix, Kpatterns (images derived from partial sums of power
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 Geometry Glossary  Jaime Garmendia III; Interactive Mathematics Online (IMO)
Definitions of most of the words you'll need in geometry. Also some algebra and trig terms.
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 Geometry In Action  David Eppstein, Theory Group, ICS, UC Irvine
A collection of applications of computational geometry: areas in which ideas from discrete and computational geometry (meaning mainly lowdimensional Euclidean geometry) meet some real world applications, with brief descriptions of those applications
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 Geometry in Motion  Daniel Scher
Direct interaction with geometric diagrams, courtesy of JavaSketchpad. The contents include a variety of curvedrawing devices (Intersecting Circles, Falling Ladder, Van Schooten's Parabola, and more); also other activities such as Constant Perimeter
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 geometryinstitutes  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. Postings include planning for and information about geometry institutes held around the country. The Forum's teacher workshops hold discussions on this group
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 Geometry  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
More than 95 games or puzzles having to do with geometry, chaos, fractals, and topology with extensive discussions and solutions. Most require a browser capable of displaying JavaScript or Java.
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 The Geometry Junkyard  David Eppstein, Theory Group, ICS, Univ. of California at Irvine
A collection of usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry  some serious and much also entertaining. Junk sorted into piles (Topics):
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 Geometry (MathPages)  Kevin Brown
"Informal notes" by Kevin Brown on geometry: constructing the heptadecagon, what mirrors do, the golden pentagon, the grazing goat and the lune, Napoleon's theorem, chess boards, Diophantine geodesic boxes, Zeno's mice and the logarithmic spiral, and
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 Geometry.Net
An online learning center offering extensive lists of links to sites with material in Basic Math; Pure and Applied Math; Computer & Internet; Technology; Biographers; Physics; Biology; and Sports.
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 Geometry of Fullerenes  Slavik Jablan, Mathematical Institute, Belgrade
Fullerenes (Buckminster Fuller) are considered from the points of view of geometry, graph theory and knot theory. Contents: Introduction; General fullerenes, graphs, symmetry and isomers; 5/6 fullerenes; Knot theory and fullerenes; "Perfect" fullerenes;
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 Geometry of Harmonic Maps  Y. L. Lin, Fudan University, Shanghai, China
A book which, though not a complete description of the theory, provides an introduction and an approach useful to researchers and graduate students in differential geometry, geometric analysis, differential equations and theoretical physics. Harmonic
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 Geometry of SelfContacting Binary Fractal Trees  Michael Frame; Union College, Schenectady, NY
Animations illustrating the constructions of binary fractal trees, with branch scaling chosen so some points of the left and right branches intersect, but only at the branch tips. The animations show how the geometry of the tree, and of the branch tips,
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 Geometry of the Sphere  John C. Polking, Rice University
This set of Web pages formed the text for part of the Advanced Mathematics course in the High School Teachers Program at the 1996 IAS/Park City Mathematics Institute. Material covered includes basic information about spheres, proof and consequences of
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 The Geometry of War, 15001750  Museum of the History of Science, Oxford
A virtual version of an exhibition from The Museum of the History of Science in Oxford on the uses of geometry in the art of warfare during the Renaissance. The site includes summaries that list the instruments and books in the exhibit and also provide
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