 General Mathematics, AM (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
Short articles on basic mathematics, including biographical information about mathematicians, from the abacus to Gaspard Monge.
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 General Mathematics, NZ (Funk & Wagnalls Multimedia Encyclopedia)  Lycos Zone: Mathematics
Short articles on basic mathematics, including biographical information about mathematicians, from John Napier to Zeno of Elea.
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 GeniusCorner  Dheeraj Khatter
Adaptive online learning platform for practicing math at your own pace. Freely access multiple choice and fillintheblank math quizzes, organized by grades from preK through eighth; GeniusCorner keeps time, scores responses, and offers explanations.
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 Geoboards in the Classroom  Tom Scavo
A Web unit for teachers from Tom Scavo that offers suggestions for using geoboards to explore the length and area of twodimensional geometric figures. The Introduction includes pages that describe materials needed, offer discussion and activities for
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 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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 GeoGebra
GeoGebra is free dynamic mathematics software for schools that joins geometry, algebra, and calculus. Help, examples, screenshots, and more are available online. The GeoGebraWiki is a free pool of educational materials for GeoGebra where anyone can contribute
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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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 Geomet3D  JuanCarlos CriadoAlamo
Geomet3D is an analytic geometry program in 3D. You can plot points, vectors, lines, and planes; and do basic analytic geometry operations with them.
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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 Bibliography  Key Curriculum Press
This bibliography lists publications that concern the software application the Geometer's Sketchpad, Dynamic Geometry in general, and the mathematical and educational contexts in which they are relevant: research, reviews, and applications.
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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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 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  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 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 Shapes (SMILE)  Violet M. Nash, Spencer Math and Science Academy
A 2nd grade lesson on identifying geometric shapes using colors and math problems. Also see a followup lesson on geometric shapes and making a vest. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the
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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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 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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 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 Everywhere  Betty R. Allen; Kodak
An activity intended to make students more aware of geometric shapes and lines in objects around them. Students were divided into five groups, four to photograph geometric shapes and concepts at home, on the farm, in town, and at the lake, and one group
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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  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 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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 Geometry in Motion  George Beck; MathSource
Mathematica notebooks. MapPoint is a geometry program that combines the traditional geometric constructions of classical Euclidean geometry with the more dynamic geometric transformations of modern geometry. Many examples are given showing how to create,
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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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 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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 The Geometry of Perfect Parking  Simon Blackburn
To parallel park, how much space do you need beyond the length of your own car? Invoking circles and the Pythagorean Theorem, this PDF shows how to write down a formula to navigate this everyday predicament of practical geometry. Written by a professor
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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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 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  Paul Bourke
Explorations and renderings of various surfaces and forms, including knots, surfaces, 3D shapes, curves, algorithms, tilings, plexagons, etc. Formulae for Quadrics (Surfaces of degree 2); Superellipse and superellipsoid; SuperToroid (3D); Plexagons; Hexagonal
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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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 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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 geometrypuzzles  Math Forum
A discussion group accessible as a Webbased discussion, a mailing list, or a Usenet newsgroup, for interesting problems and conundrums that require only a knowledge of elementary geometry, and discussions of solutions. Read and search archived messages;
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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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 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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 Geometry (Seeing is Believing)  De Silva, D'Andreti; ThinkQuest 1997
A geometry tutorial, comprising: the basic building blocks of geometry; segments and rays; angles; parallel lines; triangles; polygons; right triangles (Pythagorean theorem); geometric inequalities; ratios, proportions and similarities; trigonometry;
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 Geometry Then and Now  Jordana Wiener; Tufts University
Final paper for a Greek Science course at Tufts. Introduction: Although present day society is technically dimensions ahead of the ancient Greeks, we owe much of our progress to them. What is amazing is not so much that we are more scientifically advanced
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