
Also TryGames
 Math Lessons (Awesome Library)
Provides lessons, worksheets, and activities.
Lesson Plans
 Teichmuller Space Navigator Geometry Game
Provides the navigator. 1009
Lists
 By Topic (Math.com)
Provides geometry lessons and quizzes. Examples of topics include definitions, polygons, quadilaterals, Pythagorean theorem, prisms, pyramids, circles, spheres, cylinders, triangles, squares, and square roots.
 Circles in Geometry (TeachNet)
Provides a single lesson.
 Geometry (Weisstein and Wolfram Research)
Provides a comprehensive set of advanced resources in geometry, including differential, noneuclidean, plane, line, coordinate, inversive, and much more.
 Geometry  Native American Designs (Hardaker)
Provides hexagons, family square designs, landscaping, symbolic secrets, and more. 601
 Geometry Lessons (PBSLearningMedia.org)
Provides 17 lessons, by topic.
 Geometry Problems (Lanius)
Provides 10 sets of problems and includes the "golden ratio." 802
 Geometry Problems Using Pinwheels (Lanius)
Provides lessons in geometry based on spinning pinwheels. 802
 Geometry Step by Step (Geometry Step by Step  Gutierrez)
"Provides an eclectic mix of sound, science, and Incan history intended to interest students in Euclidean geometry. The site includes geometry problems, quizzes, quotations, scientific speculation, and more." 1003
 Geometry and Algebra  Relationships (NCTM)
"This example illustrates how students, using dynamic and interactive geometric figures, can understand connections between algebra and geometry, as described in the Connections Standard. They can develop an understanding of how to justify geometric relationships in a technological environment, as described in the Geometry Standard." 602
 Geometry and the Imagination (Conway, Doyle, Gilman, and Thurston)
Suggests imaginative ways to introduce and teach geometry. 1009
 Geometry, Number Theory, and More (Mrs. Glosser's Math Goodies)
Provides online interactive math problems in geometry, number theory, and more.
 Grade and StandardsBased Lessons (Illuminations  NCTM)
Provides dozens of NCTM math standardsbased lessons by topic.
 Interactive Geometry (Geometry Center)
Provides online interactive math problems in geometry.
 Math by Topic (ProTeacher)
Provides carefully selected sources of lessons in fractions and decimals, geometry and measurement, patterns and relationships, and whole number operations. 1299
 Problems and Solutions (eMathematics.net)
Provides problems, explanations, and solutions. 1009
Materials
 Differential Geometry Resources (Fife and Husch)
Provides over two dozen sources on differential geometry. 500
 Geometry Links (Eppstein)
 Geometry Resources (Fife and Husch)
Provides near 250 sources on geometry. 500
 Geometry Resources (Math Forum)
 Spheres (Polking)
Provides explanations and diagrams related to spheres in geometry. 500
Multimedia
 Software for Geometry (Geometry Technologies  ScienceU.com)
Provides software for geometry. 501
Papers
 Geometry (Schooltube.com)
Teachers provide tutorials on videos. 0912
Projects
 Curves  How They Are Classified (Xah Lee)
Provides an explanation on how curves are classified, how they are named, interconnections between curves, and much more about specific curves. 500
 Curves  Special Plane Curves (Xah Lee)
Provides diagrams of special curves discussed in geometry. 500
 Curves Index (University of St. Andrews, Scotland)
Provides famous geometric curves. 400
 Curves Index (Xah Lee)
Provides a history, description, diagrams, properties, and formulas of many curves. Listed by alphabetically by name.
 Geometry  History and Definitions (Columbia Encyclopedia)
Provides an explanation of the different types of geometry, including analytic, descriptive, nonEuclidean, projective, differential, and algebraic. Also provides a history of geometry and definitions. 500
 Geometry Basics (Zobel)
Teaches the basics of geometry using diagrams and examples. 400
 Geometry Formulas (Geometry Technologies  ScienceU.com)
Provides formulas for Lines, Distances, Angles, Concurrence and Collinearity, Triangles, Quadrilaterals, Regular Polygons, Circles, Conics, Cartesian, Cylindrical, Spherical Coordinates, Rotation and Polar Coordinates, Cartesian Symmetries, Direction Angles and Cosines, Planes, Regular Polyhedra, Cylinders, Cones, Spheres, and Torus. 501
 Geometry Formulas for Surface Areas and Volumes (Manura)
Provides simple drawings with the formulas. A basic reference for geometry. 100
 Geometry Questions and Answers (Math Forum  Ask Dr. Math)
Includes key questions asked by high school students about geometry problems.
 Geometry Questions and Answers (Math Forum  Ask Dr. Math)
Includes key questions asked by middle school students about geometry problems.
 Glossary for Geometry (Lanius)
Provides definitions of key words used in introductory level geometry. 802
 History of Geometry (Lanius)
Provides a short history and an assignment at the end. 802
 Introduction to Geometry (Think Quest 2647)
Provides an introduction to points, lines, space, theorems, postulates, and proofs. Also provides sample problems and a glossary. British 500
 Orbifolds (Conway)
Provides equations for Unbounded Populations, Limits on Growth, Equilibria, Stability, and Phase Space Harvesting. 1009
 Platonic and Archimedean Solids (Geometry Technologies  ScienceU.com)
Provides diagrams of the Platonic Cube, Dodecahedron, Icosahedron, Octahedron, and Tetrahedron. Includes diagrams of the Archimedean Cubeoctahedron, Icosidodecahedron, Rhombicubeoctahedron, Rhombicosidodecahedron, Rhombitruncated Cubeoctahedron, Rhombitruncated Icosidodecahedron, Snub Cube, Snub Dodecahedron, Truncated Cube, Truncated Dodecahedron, Truncated Icosahedron, Truncated Octahedron, and Truncated Tetrahedron. 501
 Tilings and Tesselations (Geometry Technologies  ScienceU.com)
Provides different kinds of tiling, the math behind them, how to make them, and classify them. 501
Standards
 Game  Teichmuller Space Navigator Geometry Game
Provides the game. 1009
 Geometry Exercises (AAA Math  Banfill)
Provides interactive practice by topic and includes volume, area, surface area, circumference and perimeter, polygons, and more.
 Geometry Projects and Tools (Costantino and Ewing)
Provides geometry tools, called Ptools, with an emphasis on Ptolemy. 500
 Interactive OnLine Geometry
Provides games and activities. 1009
 Tetrahedral Puzzle (Geometry Technologies  ScienceU.com)
"The object of this puzzle is to reconstruct a cube from ten tetrahedral pieces." 501
Worksheets
 Grade 07 Math Standards (McREL) Geometry
Provides standards.
 Grade 07 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 08 Math Standards (McREL) Geometry
Provides standards.
 Grade 08 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 09 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 10 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 11 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 12 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 502
 Grade 9  12 Math Standards (McREL) Geometry
Provides standards.
 Grade 9  12 Math Standards (Texas)
 Geometry and Measurement (ProTeacher)
Provides 10 sources of lessons. Many include worksheets. 1299
