 GeomeTree  John Miller
Explore fractals with this treedrawing app for iPod, iPhone, and iPad. Choose the number of branches, angle between branches, and the common ratio of the levels in the tree. See, in particular, the exercises and open questions on GeomeTree for the
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 Geometria  Valerio Capello
A program for computing lines, surfaces and volumes of the main plane and solid figures, through direct and indirect formulas. Select the figure you are working on, choose the kind of calculation from the list provided, and then click the Compute button
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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 Factoring  Suzanne Alejandre
A Math Forum Web Unit. Understanding factoring through geometry: students work cooperatively to display a numeral as the area of a rectangle, and make as many rectangular arrangements as possible for each numeral given.
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 Geometric Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for twodimensional figures: triangle (equilateral, isosceles, right, scalene); quadrilateral (general, square, rectangle, parallelogram, rhombus, trapezoid, kite, cyclic and cyclicinscriptable); regular polygon; circle (arc, segment, sector);
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 Geometric Sculpture  Elias Wakan
Sculpture inspired by a love of geometric form.
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 GeometriX  Benko Computer Software Ltd., Turkey
Windowsbased geometric drawing, presentation, and testing system for primary to high schools. Make worksheets using the commercial software, and your students can view them on their computers or on the web using the free viewer software. Trial version
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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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 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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 Geometry Bridge  Joe Bender
Build bridges that allow the school buses or trucks to safely cross the river in these animated Shockwave Flash tutorials, which teach and exercise skills such as identifying types of angles and triangles, and calculating angles in a triangle and sidelengths
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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 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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 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 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 Homepage  ThinkQuest 1997
Illustrated tutorials on many aspects of geometry, including: triangular geometry, the Pythagorean Theorem, polygonal geometry, polyhedra, and nonEuclidean geometry. Also includes a list of important geometric formulas.
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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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 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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 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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 Geometry of War  Ivars Peterson (MathTrek)
Leonardo da Vinci was not alone in his fascination with military technology. The University of Oxford's Museum of the History of Science is now featuring a fascinating online exhibition called The Geometry of War, 15001750. The 81 illustrations, accompanied
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 Geometry Online  Cynthia Lanius
Geometry activities from a geometry class at Milby High School in Houston, Texas. Topics include: History of Geometry (contributions of Egyptians, Babylonians, and Greeks, with links to biographies of major contributors to geometry); Hidden Polygons (locate
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 Geometry On the Sphere (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Great circles on the sphere are the analogs of straight lines in the plane. Such curves are often called geodesics. A spherical triangle is a region of the sphere bounded by three arcs of geodesics... Geometry on the surface of the sphere will come in
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 The Geometry Pages  Cathi Sanders
Illustrated essays designed to intrigue and inspire you to learn more about geometry and its many applications in art, engineering, science, and more. Includes the following topics: Lines (History, Elements of Geometry, Polygons, Tessellations); Numbers
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 Geometry Park: Songs for Teaching Children  Illumisware
Collection of children's songs using contemporary rhythms and sounds to introduce topics in math, science, grammar, and geography. American or Canadian versions each come with teachers' guide and karaoke version.
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 Geometry Playground  Exploratorium
An exhibit from San Francisco's Exploratorium. Peoplesized exhibits let you use your hands, brain, and body to play with physical demonstrations of geometry concepts. Exhibits fall under the categories of seeing, moving, and fitting things together,
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 geometryprecollege  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for discussions concerning school geometry curricula, teaching geometry, new software and texts, problems for students, and supplementary materials such as
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 Geometry Reference Sheets & Mnemonics (S.M.A.R.T.)  Math Share Shop
Methods of proving two angles congruent; Two angles are congruent, if...; Two triangles are congruent when...; When proving triangles congruent...; Right triangles; Quadrilaterals; Formulas of the Area; Summarizing geometry of the Triangle; Coordinate
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 geometrysoftwaredynamic  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup. This group focuses on discussion of such geometry software programs as The Geometer's Sketchpad and Cabri Geometry II. Read and search archived messages; and
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 Geometry through Art  Norman Shapiro
Lesson ideas, facilitation suggestions, lists of materials needed, and handouts to photocopy. Norman Shapiro focuses on the student as investigator, learning through doing, and using perception to stimulate the motivation for more developed concepts and
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 Geometry Turned On: Dynamic Software in Learning, Teaching, and Research  J. King and D. Schattschneider, Editors
This book contains twentysix papers about aspects of dynamic software for geometry. The book does not contain software itself, but this site includes downloadable files for many of the papers in the book. For a discussion of what the book is about, see
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 George Pólya  Australian Mathematics Trust
A biography of the mathematician that discusses his solution of the random walk problem, influential books on problemsolving, Enumeration Theorem and Necklace Theorem, and efforts in curriculum development, reform, and competitions. The biography mentions
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 George Washington: Surveyor and Mapmaker  Library of Congress
An essay on George Washington's lifelong association with geography and cartography, "Tracing the Maps in George Washington's Life" contains the chapters Washington as Public Land Surveyor  Boyhood and Beginnings; Washington as Public Land Surveyor 
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 George W. Hart: Index  George W. Hart
An index to some of the areas covered by Hart's Web pages: Geometric sculpture; Encyclopedia of Polyhedra  over 1000 virtual polyhedra; Pavilion of Polyhedreality  images and geometry links; Hart's upcoming book about Zome Geometry; research and publications;
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 Gepeto Software  Joe Tompkins
MathMaker:Skills and MathMaker:Fractions  programs to purchase for creating instant worksheets, tests, and math games.
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 Gerard M. Enright
The resume of a mathematics professor at Mary Immaculate College in Ireland. Articles on using BASIC programs in the classroom (to search for numbers that are both square and triangular and to investigate a conjecture about a function of the nonnegative
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 German Language Math Resources  Math Forum
Mathematics and math education resources available online in German, collected by the Math Forum. Sites are organized by: Research Centers, Articles and Publications, Software, and Other Educational Resources.
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 Get Math.com
CDs and DVDs: Solving Algebra Word Problems, Beginning Algebra, Intermediate Algebra, and The Get Math Series (10 textbooks on various math subjects). Each learning system includes embedded video of mathematic professors explaining specific exercise sets.
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 Getsmarter.org  Council on Competitiveness
A free web site designed to help improve math and science education. Interactive quizzes, games, and tutorials allow students to learn more about specific topics and improve their skills. MSTV, a series of interactive modules, shows how math and science
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 Getting Across the River  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions such as "A man has a goat, a wolf and a cabbage. He must cross a river in a boat that will only carry one item at a time...."
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 Getting Slammed in Tennis  Ivars Peterson (MathTrek)
One arena where it's possible to test the apparent relationship between psychological momentum and sequences of successes or failures is bestoffive tennis matches. The question is whether the result of the first set changes the probability of success
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 Getting To Know You (SMILE)  Kathy Koval, Randolph School
A lesson for any grade designed to teach students to use a ruler and measure accurately to the nearest inch; draw and label properly different graphs (line, pie, bar, pictograph); estimate/record measurement on a number line using intervals; and collect
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 GFBrandenburg's Blog  Guy Brandenburg
In his opening post, Brandenburg wrote, "I have been doing some research on educational progress (or lack thereof) in the Washington, DC school system before and after the reign of our mediadarling school Chancellor, Michelle Rhee...." The retired high
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 Gifted and ADD/ADHD  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on attention deficit disorder and attention deficit hyperactivity disorder, primarily as related to the education of gifted children.
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 Gifted Children with Special Needs: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on children who are learning disabled, in particular in the context of those who are also gifted children.
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 Gifted LearningLinks  Center for Talent Development, Northwestern University
Gifted LearningLinks offers academically talented students in Kindergarten through Grade 12 the opportunity to take enrichment, high school honors, AP and university credit courses onlinefrom wherever they are, whenever they want, at a pace appropriate
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 Gifted Programs: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on education programs for gifted children: schools for the gifted, early college, Saturday and summer programs, and talent searches.
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 Girls' Angle
Girls' Angle is a math club for girls and a supportive community for all girls and women engaged in the study, use and creation of mathematics. By mentoring, publishing the bimonthly Bulletin, and solving math problems on commission, networking professional
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 Girls' Attitudes, SelfExpectations, and Performance in Math  Michelle Maraffi; Math Forum
For those concerned about girls' negative attitudes and expectations in the study of mathematics who want to improve and increase girls' performance and learning in math: an annotated bibliography of articles and studies designed to give teachers and
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