 General Tables of Units of Measurement  Office of Information Services, National Institute of Standards and Technology (NIST)
Tables of metric units of measurement; tables of U.S. units of measurement; notes on British units of measurement; tables of units of length (international and survey), area (international and survey), capacity (dry and liquid volume measure), mass not
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 A Genetic Algorithm  Harold Brochmann
Genetic algorithms are computer programs that model evolution and natural selection in looking for 'good' solutions to problems that do not have a prescribed solution procedure. This article describes the output of a demonstration GA program.
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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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 Genuine Fractals Software  Altamira Group, Inc.
Genuine Fractals™ plugins for Adobe Photoshop and compatible image editing programs enable highquality digital photo enlargements and artwork at various sizes and resolutions from the same low to mediumresolution originals. Stepbystep instructions
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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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 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
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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 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 Geomaths MathHelp material  University College London (UCL)
Part of the Interactive Mathematics and Geoscience Education (IMAGE) project, Geomaths MathHelp provides mathematics selfstudy material embedded within the geological sciences. MathHelp "notebooks" cover specific mathematical topics accessed through
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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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 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 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: 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 Spirograph Lab  Mike Riedy
Spirograph Machine, or Tea Cusps and Saucers. This lab studies the effects (both mathematical and artistic) of circular motion as points rotate around circles. Interesting things occur when a point moves around a circle as the circle rotates around another
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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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 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  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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 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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 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 Bingo (SMILE)  Anne Lawrence, Wells Community Academy
A lesson for grades 710 designed to teach students to name and identify 20 geometric shapes. From the Recreational and Creative Math section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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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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 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 designs in the game of Life (SMILE)  Willaim Byrne, Martin Luther King High School
A lesson designed to predict and discover patterns generated in the game of "Life," using large checkerboards and checkers or flat counters. From the Recreational and Creative Math section of a collection of almost 200 single concept lessons by the Science
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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 Functions  Scott Steketee
Activities to develop function concepts with the "compelling kinesthetic experiences and opportunities for explicit discourse" available through geometric transformations (reflections, rotations, translations). Geometric Functions resources fulfill the
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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 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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 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 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: 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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