 Gallery of Interactive OnLine Geometry  The Geometry Center
Twelve interactive online geometry programs: WebPisces (compute implicitly defined curves in the plane); Build a Rainbow (a lab that examines a mathematical model of light passing through a water droplet); QuasiTiler (generate Penrose tilings or design
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 Gallery of Mathematical Images  Dept. of Mathematical Sciences, Loughborough University, UK
The Mandelbrot Set (frames from an animation); Quaternionic Fractals (an extension of the complex numbers  Mandelbrot and Julia sets); Hyperspace (4dimensional structures projected into 3dimensional space); Molecular Dynamics (images from simulations,
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 Gambit  Theodore Turocy, Director
An opensource collection of tools for doing computation in game theory. Gambit lets you build, analyze, and explore game models.
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 The Game of Chaos  Juergen Giesen
This applet performs the following game at varying speeds: Choose a random starting point (o) within the triangle ABC. Roll a die. Connect the point with point A, when you roll 1 or 2; with point B, when you roll 3 or 4; with point C, when you roll 5
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 The Game of Life: (Serendip: Complex Systems)  Bryn Mawr College
Order without a planner: play a Java game about a world consisting of locations that may or may not be occupied by life. At each step, life persists in any location where it is also present in two or three of the eight neighboring locations, and otherwise
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 The Game of Nim Explained  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of the famous game, with a theoretical explanation and extension to other similar games: see also similar Java games: Nimble, Northcott's game, Plainim, the Scoring game, and Turning Turtles.
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 Games2Learn
Vendor of educational games, software, and activities for both parents and teachers. The site may be searched by category (Math, Spatial Learning, Science and Tech, etc.), grade level, game type, or personality profile (Planner, Peacekeeper, Producer,
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 Games and Puzzles  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Almost 40 games or puzzles, with extensive discussions and solutions. Examples include the Monty Hall Dilemma, Lewis Carroll's problem; the game of Nim, the 3 glass puzzle, Northcott's game, the Tower of Hanoi, and many more. Most require a browser capable
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 Games for the Brain  Philipp Lenssen
Race the "IQ Score" clock while playing JavaScript brain teasers such as NumberCruncher (perform arithmetic calculations following order of operations) and Marsmoney (calculate the values of different currencies). The site also features several memory,
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 GAMES Group  The University of Alberta
GAMES is a research group for Gameplaying, Analytical methods, Minimax search and Empirical Studies. It produces realtime programs for strategic game such as Amazons, Awari, Checkers, Chess, Domineering, Go, Hex, Lines of Action, Othello, Poker, RoShamBo,
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 Game Theory .net  Mike Shor
Lecture notes, text book reviews, and interactive applets and games, print and online tests and quizzes, a section on game theory in pop culture, and links to other resources on the web.
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 A Gamma Process  Charlie Geyer
An applet that draws a Gamma process, a stochastic process with independent increments.
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 Gary Haynes  Gary Haynes
Course syllabi, lesson plans, homework, and objectives. Visit "Tangrams and Other Games" for an interactive tangram story and a Flash presentation on how to develop an understanding of functions through the use of the motion sensor.
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 Gasoline Sales  Reading a Chart  NASA Lewis Learning Technologies Project
This chart shows the actual and predicted gasoline sales for one year. During which month was there the greatest difference between the predicted and actual gasoline sales? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Gateway to Logic  Christian Gottschall; Dept. of Philosophy, Vienna
A collection of Webbased logic programs offering a number of logical functions. Client side processing (requires Java): sparse trees, alpha graphs (Peirce), Begriffsschrift notation (Frege), Polish notation, truth tables, normal forms, miscellaneous
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 Gaussian Integer Calculator  Dario Alejandro Alpern
Applet that evaluates numerical expressions using Gaussian integers, factors Gaussian integers, and evaluates functions, including the greatest common divisor (GCD), modular inversion, and modular exponentiation, among others.
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 GCSE Maths Quizzes  Education Quizzes
Dozens of online maths quizzes to practice concepts tested on the UK's General Certificate of Secondary Education. Choose from receiving the correct answer after each question or seeing incorrectly answered questions again later. Freely sample some of
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 GCSE Maths Tutor
A free maths revision resource for GCSE/Secondary/High School math. The site offers worksheets, interactive programs, videos, a blog, a discussion forum, and more.
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 General Educational Development (GED)  About.com
A guided portal to the world of the GED test. Includes links to the official GED site, free and commercial preparation sites, practice tests, software, courses, and articles. From About.com's Adult/Continuing Education section.
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 Generating Functions  Interactive Mathematics Miscellany and Problems, Alexander Bogomolny
The definition and properties of generating functions with several examples, including variants of coin change, fast algorithm for computing Banzhaf and ShapleyShubik power indices, covering the chessboard with tromino and more. Many examples are illustrated
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 Generic Two integer variable equation solver  Dario Alpern
Java/JavaScript code that solves Diophantine equations of the form Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0 in two selectable modes: solution only and stepbystep (or teach) mode. With a link to his description of the solving methods.
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 The Genome Multimedia Site  Brandeis University
An interactive course that introduces how some concepts of probability theory (combinatorics, mutation), information theory (bit definition, entropy), alignment theory (programming, scoring, matrices), and statistics (populations and samples, histograms,
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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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 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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 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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 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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 Geometrí con Cabri Géomètre II  José Antonio Mora
Materiales interactivos para el aprendizaje de la Geometría con la utilización del programa CabriGéomètre II. Geometría de los Mecanismos; Coordenadas en Cabri II. Cabri sketches that simulate the working procedure
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 Geometria  Stelian Dumitrascu
A Java program in interactive solid geometry. Solids can be revolved, cut,
joined, built from scratch, measured, and drawn upon. View demo applet online or download a shareware version of the program. (Geometria can be run as a standalone application
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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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 Geometric Constructions  Arlen Strader; College of Education, Texas A&M University
A 1997 Java applet that simulates compassandruler constructions, with a lesson in its use.
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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 Assistant  ThinkQuest 1998
An applet/application for drawing dynamic geometry constructions: move any movable point and Geometry Assistant will automatically recalculate and redraw the whole construction. The site includes a place to add your unsolved geometry problem, and a Library
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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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 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 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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 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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 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 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 Playground  Daniel J. Heath, Joshua Jacobs
Geometry Playground is a straightedge and compass construction tool for multiple geometries. The Java code is opensource, and the accompanying wiki includes handson discovery activities.
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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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 The Geometry Section (Zona Land)  Edward A. Zobel
Fractals (fractal tree, VRML fractal monoliths), common shapes (circle, rhombus, trapezoid), areas and volume (box, cylinder, box with cylindrical hole), coordinate geometry (VRML (x, y, z) Axes and Planes Worlds), and points, lines, and planes (symbol
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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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 Gerry Stahl's Website  Gerry Stahl
Publications, teaching, research, and more by the author of Constructing Dynamic Triangles Together, Group Cognition, and Translating Euclid, among others. The founding Executive Editor of the International Journal of CSCL (ijCSCL), Stahl has researched
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 Get the Turtle to the Pond: Developing Geometry Concepts Using Computer Programming Environments (iMath Investigations)  Illuminations; National Council of Teachers of Mathematics (NCTM)
An online, interactive, multimedia math investigation. Computer programming environments can be used to help children understand geometric concepts. The interactive tool in this iMath investigation illustrates how LOGO can be used to foster creative
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 GIFsmos  Lusto, Chris; Luberoff, Eli; and Merrill, Jason
Takes any animated Desmos plot and converts it into a dynamic graphic. GIFsmos lets you determine the size of the resulting gif animation, and toggle its frame interval from 0.1 to 1.0 seconds.
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 Global Institute of Mathematics  Jim Stone, Global Institute of Mathematics
A traditional high school curriculum of Algebra, Advanced Algebra, PreCalculus and Calculus, delivered online via email and the Web. Sample lessons available.
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 Globally Accessible Statistical Procedures (G.A.S.P.)  R. Webster West, Dept. of Statistics, Univ. of South Carolina
Online statistical routines for data analysis procedures or for educational procedures. Java or HTML Forms procedures include kernel density estimation, statistical procedures for the AIDS epidemic, an applet for understanding the spread of a simple epidemic,
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 Global Student Network  Global Student Network, LLC
Provider of online homeschool curriculum, delivered entirely over the Internet. Over eighty courses for grades 212. Free online demo.
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 GoConqr  Examtime
Animated mind maps, quizzes, notes, slides, flowcharts, and other crowdsourced interactive study resources that flip, shuffle, and track your progress — such as a set of 22 flashcards for New GCSE Maths required formulae — or create your
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