 Gaussian Curvature (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
What is the curvature inside the region on a sphere exterior to a tiny circle? On a polyhedron, what is the curvature inside a region containing a single vertex? two vertices? all but one vertex? all the vertices?
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 Gavin's Calculus Projects  Gavin LaRose, University of Michigan Math Department
Calculus I, II, and III projects and archives. Recent or current projects include: Calc I: Caustic rain, Profitable production. Calc II: Wonder drugs, Floating, Spagopolis. Calc III: Manufacturing, Production costs. Project archives from 1995 on. Also
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 GCSE Maths  Edexcel
Specimen papers and mark schemes, teachers' guides, linear and modular specifications, resources and publications, support tools, news, training events, and more from the test prep company used by over two thirds of schools and colleges in the UK.
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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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 Gene Abrams
Beamer files for seminars and colloquia on Leavitt path algebras, and activities related to mad veterinarian puzzles": "The Graph Menagerie: Abstract Algebra meets the Mad Veterinarian"; "The Graph Menagerie: Abstract algebra and the Mad Veterinarian"
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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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 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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 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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 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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 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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 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 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 Constructions  Barry Sanders
Constructions made using the Geometer's Sketchpad: Malfatti Circles (construct 3 circles internal to any triangle, each circle being externally tangent to the other two, and each touching adjacent sides of the triangle); Hart Circle (construct the circle
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 Geometry Distance of Triangles using a Protractor (SMILE)  Eileen Lally, A. Philip Randolph Magnet School
Students in the 7th grade learn how to use the protractor to measure angles, and use this ability to solve a problem involving distance. From the Geometry and Measurement section of a collection of almost 200 single concept lessons by the Science and
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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 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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 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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 Geometry of the Sphere  John C. Polking, Rice University
This set of Web pages formed the text for part of the Advanced Mathematics course in the High School Teachers Program at the 1996 IAS/Park City Mathematics Institute. Material covered includes basic information about spheres, proof and consequences of
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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 Web Page  Ephraim Fithian; Kutztown University
Sixteen geometry activities: Tangrams; Golden Ratio; Geoboard; Polygons; Symmetry; Constructions; Polyominoes and Polyiamonds; Star Polygons; Special Points in Polygons; Polygon Tessellations; Kaleidoscope Tessellations; Escher Tessellations; Space Cubes;
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 George Washington School Copy Book  Library of Congress
Scans of a school copy book handwritten by the future first U.S. President in 1745, when 14 or 15 years old. Together with a second book, these reveal geometrical definitions and problems, surveying, mensuration, multiplication and division, simple interest,
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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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 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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 Glossary  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A glossary of terms that also serves as an alphabetical index to Bogomolny's site. Each term is linked to an illustrated essay.
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 GoGeometry from the Land of the Incas  Antonio Gutierrez
Mixing dynamic geometry, animations, science, and Incan history, this Peruvian site offers geometry problems involving circles and triangles, with proofs: Poncelet, Napoleon, Eyeball, Steiner, Carnot, Sangaku, and the Butterfly Theorem. Also, Incan Geometry
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 GoKidding  Sarveshwar Rao
Flash activities on counting, adding, subtracting, and naming shapes (polygons). Worksheets include circle mazes, fun with circles, and fun with triangles.
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 Gold Medal Math  EdVenture Software
An educational software program which reinforces math skills through ten 3D animated Olympic events for students in grades 26. Site includes product description, screen shots, ordering and contact info. Typing program also available.
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 GoldStudent Helps Your Child Excel in Math  GoldStudent
An online math enrichment and assistance program for students K6. With customized study guides and over 4 million math worksheets, GoldStudent is designed to help children improve their problemsolving skills, gain confidence in their math abilities
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 GOMATH  Cubic Science, Inc.
An Internet site to help high school students (grades 1012) of all levels with math skills. Programs such as Algebra 1 offer an interactive guide through a course and help students build up math skills and confidence. Math Programs are 46 week curricula,
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 GoodQuestions Project  Dept. of Mathematics, Cornell University
The GoodQuestions project seeks to improve college calculus instruction by adapting two methods developed in physics instruction — ConcepTests and JustinTimeTeaching. GoodQuestions is a pedagogical strategy that aims to raise the visibility of the
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 Googol Learning  Susan Jarema
"It wasn't until I began teaching my own children math and had to relearn it that I began to see its beauty...." From the family publishers of the Discovery Multiplication Program, music such as "Multiplication Vacation," and other educational DVDs, games,
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 Googol Power  Susan Jarema, Googol Learning
What started as a fun way to help children learn math grew into two soundtracks and a 90minute video with puppet stars. Sound samples, video clips, and free worksheets are available on the site, as well as further information about the project. Worksheets
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 Gordon Royle's Homepage: Research  Gordon Royle
Catalogues and tables of interesting combinatorial objects: small graphs, cubic graphs, symmetric cubic graphs, vertextransitive graphs, Cayley graphs (by group), vertextransitive cubic graphs, cubic cages and higher valency cages, planar graphs, cubic
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 Gordon's Games, Simple Math, Not So Simple Math, Not Just Math  Gordon Scott
Booklets intended to be a resource for those who teach Primary Math, K3, ages 48: beginning teachers, home schooling parents, teachers of teachers, and teachers wishing to supplement a text. Over 25 simple and inexpensive math games; basic math with
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 Got Math?  Dave Radcliffe
Blog by a community college math instructor and selfdescribed "GeoGebra fanatic." Posts, which date back to December, 2010, have included "Stacking cannonballs," "Counting with Integrals," "A Paradoxical Dissection," "Gelfand's Question," "Imagining
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 Goudreau Museum of Mathematics in Art & Science  Stephanie Killian
When you visit the Math Museum in New York, you can build a math model; explore games and puzzles; view exhibits demonstrating how math is used in the arts and sciences; experience challenging but nonthreatening specialized programs and workshops in math;
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 Grade Eight Problems  The Canadian School Math Page
A variety of word problems at the Canadian 8th grade level, with hints and answers.
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 Grade Eleven Problems  The Canadian School Math Page
A variety of word problems at the Canadian 11th grade level, with hints and answers.
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 Grade Five Problems  The Canadian School Math Page
A variety of word problems at the Canadian 5th grade level, with hints and answers.
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 Grade Nine Problems  The Canadian School Math Page
A variety of word problems at the Canadian 9th grade level, with hints and answers.
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 Grade Seven Problems  The Canadian School Math Page
A variety of word problems at the Canadian 7th grade level, with hints and answers.
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 Grade Six Problems  The Canadian School Math Page
A variety of word problems at the Canadian 6th grade level, with hints and answers.
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 Grade Ten Problems  The Canadian School Math Page
A variety of word problems at the Canadian 10th grade level, with hints and answers.
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 Grade Twelve Problems  The Canadian School Math Page
A variety of word problems at the Canadian 12th grade level, with hints and answers.
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 Grant Keady
Grant Keady, an adjunct professor at Curtin University, researches fluid dynamics and related subjects, with forays into computer algebra. Some of his papers are available online in PostScript, gzipped PostScript, PDF, .dvi, or Mathematica notebook format.
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 Graphing Stories  Dan Meyer and the BuzzMath Team
Videos, each 102 seconds in length, of stories for students to graph using the freely downloadable accompanying student template. Select from among constant, decreasing, increasing, linear, parabolic, periodic, piecewise, and step graphs; story subjects
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