 Geocadabra  Ton Lecluse
Download a demo or purchase this dynamic geometry software, which draws solid geometry, plane geometry, functions and curves, 1point perspective, 2point perspective, 3point perspective, and more. Also available in Dutch.
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 GeoCalc  BaldGeeks
Macintosh shareware for calculating the area, perimeter, sides, angles, and other measures of two and threedimensional shapes such as ellipses, rectangles, triangles, trapeziums, parallelograms, polygons, prisms, cylinders, cones, pyramids, and spheres.
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 GEO Gateway  NASA, John C. Stennis Space Center
A portal to information about Geographical Information Systems, Global Positioning Systems, and remote sensing. Sections for teachers, students, and professionals, as well as a barebones facts section for everyone. A National Workforce Development Education
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 GeoGebra Central  Guillermo Bautista
A collection of GeoGebra applets dating back to August, 2010: "Systems of Linear Equations," "The Angle Trisector," "Approximating Pi," "Area of a Trapezoid," "Four Leaf Petal," "Polygons with Equal Area," "Tracing the Derivative," "Paper Folding: Locating
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 GeoGebra Wiki  Linda FahlbergStojanovska
On this Wikispaces platform, users can quickly upload GeoGebra worksheets, insert screenshot images using Jing (freeware), and post equations created with Sitmo (freeware). Resources available on the site include: GeoGebra constructions, explorations,
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 Geogirls  Jenine Newman
Choose links, answer geometry questions, and gather clues to solve the mystery of the missing rhombus diamond. Read about the perfect world of geometry, learn about "GeoGuys n Gals of History," or consult the GeoDictionary of geometry terms.
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 GeoLeg  Peg Cannon
A quantitative geometry manipulative for grades 4  12. Associated lessons and tips for teachers offer ideas on visual and spatial learning for measurement and geometry.
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 The Geometer's Sketchpad and Tessellations  Cathleen V. Sanders
A tessellation tutorial that provides stepbystep instructions for tiling the plane using the Geometer's Sketchpad. Linked to it are examples of student tessellations created by Cathi Sanders' pupils at Punahou School in Honolulu, Hawaii.
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 Geometer's Sketchpad  Berger, Witzman, Pearson, Vang; The Geometry Center
Introducing elementary and secondary educators to the operation of Geometer's Sketchpad. Lessons allow teachers to access illustrations of some sample classroom uses, teaching some of the advanced functions of Sketchpad that make it a unique tool for
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 The Geometer's Sketchpad: Classroom Resources on the Web  Math Forum
A page of links to dynamic interactive geometry resources for Sketchpad. GSP at Key Curriculum Press; classroom introductions and tutorials; courses, classroom materials, and student work; and general information. See also Sketchpad Resources at the Math
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 The Geometer's Sketchpad: Classroom Resources  The Math Forum
Sketchpad and JavaSketchpad dynamic interactive geometry resources on the Math Forum Site: sketches, activities, and tours; MAA meetings and groups with presentations and sample sketches; Forum Sketchpad Web Units (Algebra & Calculus; Vectors; Morphing
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 Geometer's Sketchpad: Introductory Lab  Mike Riedy
A beginning tutorial, with worksheets, for using GSP. Lab is organized into five parts: Preliminary Setup (formatting a disk, starting and quitting the Geometer's Sketchpad, making mistakes); Toolbox (introduction to the GSP tools: circle, select, point,
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 The Geometer's Sketchpad  Key Curriculum Press
Geometry software for Euclidean, coordinate, transformational, analytic, and fractal geometry, recommended for students from grade 5 through college. Developed for geometry, students now also use Sketchpad's flexibility and reach to explore algebra, trigonometry,
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 The Geometer's Sketchpad Resource Center  Key Curriculum Press
Search collection of Sketchpad Classroom Activities for download or purchase, browse the Advanced Sketch Gallery, access Technical Support, explore some online JavaSketches created with Sketchpad, and find links to others' sketches and related resources.
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 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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 Geometiles  Yana Mohanty
Interlocking tiles for exploring plane and threedimensional geometry, among other math topics. Purchase provides access to a variety of workbooks. Blog posts by creator Mohanty, an electrical engineer who earned a PhD in mathematics before teaching college
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 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  BleezWorld
App for Euclidean geometry constructions: points, lines, circles, line segments, triangles, and more. Also available in Chinese, Hindi, Korean, and Russian.
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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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 Geometry formulas  Sergey Kondratov
Geometry formulas, each with interactive calculators: perimeters, areas, surface areas, volumes, radii, and more for plane shapes and bodies.
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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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