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## Geometry

Also Try
1. Math Lessons (Awesome Library)
Provides lessons, worksheets, and activities.

Games
1. Teichmuller Space Navigator Geometry Game
Provides the navigator. 10-09

Lesson Plans
1. 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.

2. Circles in Geometry (TeachNet)
Provides a single lesson.

3. Geometry (Weisstein and Wolfram Research)
Provides a comprehensive set of advanced resources in geometry, including differential, non-euclidean, plane, line, coordinate, inversive, and much more.

4. Geometry - Native American Designs (Hardaker)
Provides hexagons, family square designs, landscaping, symbolic secrets, and more. 6-01

5. Geometry Lessons (PBSLearningMedia.org)
Provides 17 lessons, by topic.

6. Geometry Problems (Lanius)
Provides 10 sets of problems and includes the "golden ratio." 8-02

7. Geometry Problems Using Pinwheels (Lanius)
Provides lessons in geometry based on spinning pinwheels. 8-02

8. 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." 10-03

9. 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." 6-02

10. Geometry and the Imagination (Conway, Doyle, Gilman, and Thurston)
Suggests imaginative ways to introduce and teach geometry. 10-09

11. Geometry, Number Theory, and More (Mrs. Glosser's Math Goodies)
Provides online interactive math problems in geometry, number theory, and more.

12. Grade and Standards-Based Lessons (Illuminations - NCTM)
Provides dozens of NCTM math standards-based lessons by topic.

13. Interactive Geometry (Geometry Center)
Provides online interactive math problems in geometry.

14. Math by Topic (ProTeacher)
Provides carefully selected sources of lessons in fractions and decimals, geometry and measurement, patterns and relationships, and whole number operations. 12-99

15. Problems and Solutions (eMathematics.net)
Provides problems, explanations, and solutions. 10-09

Lists
1. Differential Geometry Resources (Fife and Husch)
Provides over two dozen sources on differential geometry. 5-00

3. Geometry Resources (Fife and Husch)
Provides near 250 sources on geometry. 5-00

4. Geometry Resources (Math Forum)
5. Spheres (Polking)
Provides explanations and diagrams related to spheres in geometry. 5-00

Materials
1. Software for Geometry (Geometry Technologies - ScienceU.com)
Provides software for geometry. 5-01

Multimedia
1. Geometry (Schooltube.com)
Teachers provide tutorials on videos. 09-12

Papers
1. 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. 5-00

2. Curves - Special Plane Curves (Xah Lee)
Provides diagrams of special curves discussed in geometry. 5-00

3. Curves Index (University of St. Andrews, Scotland)
Provides famous geometric curves. 4-00

4. Curves Index (Xah Lee)
Provides a history, description, diagrams, properties, and formulas of many curves. Listed by alphabetically by name.

5. Geometry - History and Definitions (Columbia Encyclopedia)
Provides an explanation of the different types of geometry, including analytic, descriptive, non-Euclidean, projective, differential, and algebraic. Also provides a history of geometry and definitions. 5-00

6. Geometry Basics (Zobel)
Teaches the basics of geometry using diagrams and examples. 4-00

7. 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. 5-01

8. Geometry Formulas for Surface Areas and Volumes (Manura)
Provides simple drawings with the formulas. A basic reference for geometry. 1-00

11. Glossary for Geometry (Lanius)
Provides definitions of key words used in introductory level geometry. 8-02

12. History of Geometry (Lanius)
Provides a short history and an assignment at the end. 8-02

13. 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 5-00

14. Orbifolds (Conway)
Provides equations for Unbounded Populations, Limits on Growth, Equilibria, Stability, and Phase Space Harvesting. 10-09

15. 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. 5-01

16. Tilings and Tesselations (Geometry Technologies - ScienceU.com)
Provides different kinds of tiling, the math behind them, how to make them, and classify them. 5-01

Projects
1. Game - Teichmuller Space Navigator Geometry Game
Provides the game. 10-09

2. Geometry Exercises (AAA Math - Banfill)
Provides interactive practice by topic and includes volume, area, surface area, circumference and perimeter, polygons, and more.

3. Geometry Projects and Tools (Costantino and Ewing)
Provides geometry tools, called Ptools, with an emphasis on Ptolemy. 5-00

4. Interactive On-Line Geometry
Provides games and activities. 10-09

5. Tetrahedral Puzzle (Geometry Technologies - ScienceU.com)
"The object of this puzzle is to reconstruct a cube from ten tetrahedral pieces." 5-01

Standards
1. Grade 07 Math Standards (McREL) Geometry
Provides standards.

2. Grade 07 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

3. Grade 08 Math Standards (McREL) Geometry
Provides standards.

4. Grade 08 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

5. Grade 09 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

6. Grade 10 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

7. Grade 11 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

8. Grade 12 Math Standards (NCTM)
Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02

9. Grade 9 - 12 Math Standards (McREL) Geometry
Provides standards.

10. Grade 9 - 12 Math Standards (Texas)
Worksheets
1. Geometry and Measurement (ProTeacher)
Provides 10 sources of lessons. Many include worksheets. 12-99

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