Also Try Math Lessons (Awesome Library) Provides lessons, worksheets, and activities. 6-00 Games Geometry Game - Kali Geometry Game - QuasiTiler Teichmuller Space Navigator Geometry Game Lesson Plans 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. 5-00 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. 12-99 Geometry - Measuring a Tree's Height (Vratil) Provides a lesson for a group to measure the height of a tree using geometry. 8-00 Geometry - Native American Designs (Hardaker) Provides hexagons, family square designs, landscaping, symbolic secrets, and more. 6-01 Geometry - The Triangle (Teacher Created Materials) Introduces students to the triangle and basic geometry. Includes worksheets in PDF format. Grades 5 - 8. 5-00 Geometry Basics (Thinkquest Team 20991) Provides basic geometry tutorials by topic, incuding parallel lines, triangles (congruent, right, isosceles, and equilateral), quadrilaterals, parallelograms, ratios, polygons, circles, squares, rhombuses, trapezoids, volumes, areas, pyramids, cylinders, cones, spheres, prisms, arcs, angles, chords, radius or radii, Pythagorean theorem, intersections, slopes, tangents, secants, circumferences, coordinate geometry, and more. 5-00 Geometry Lesson Plans - High School Level (BigChalk.com) Provides dozens of geometry lessons and articles. Includes points, lines, angles, graphing, circles, spheres, shapes, transformation geometry, triangles, polygons, quadrilaterals, areas, and volumes. 5-01 Geometry Lesson Plans - Middle School Level (BigChalk.com) Provides dozens of geometry lessons and articles. Includes points, lines, angles, graphing, circles, spheres, shapes, transformation geometry, triangles, polygons, quadrilaterals, areas, and volumes. 5-01 Geometry Lessons (AskERIC) Provides lessons by topic and grade level. 2-01 Geometry Lessons (PBS TeacherSource) Provides eight lessons, by topic. 3-01 Geometry Problems (Lanius) Provides 10 sets of problems and includes the "golden ratio." 8-02 Geometry Problems Using Pinwheels (Lanius) Provides lessons in geometry based on spinning pinwheels. 8-02 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 Geometry and the Imagination (Conway, Doyle, Gilman, and Thurston) Suggests imaginative ways to introduce and teach geometry. 5-01 Geometry, Number Theory, and More (Mrs. Glosser's Math Goodies) Provides online interactive math problems in geometry, number theory, and more. 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 Pi Lesson in Geometry (TeachNet) Provides a single lesson. Lists Differential Geometry Resources (Fife and Husch) Provides over two dozen sources on differential geometry. 5-00 Geometry (AOL - Academic Assistance Center) Includes general math, algebra, trigonometry, geometry, calculus and advanced math. Geometry (Yahoo) Provides over 150 lessons by general grade level. 5-00 Geometry Links (Eppstein) Geometry Resources (Fife and Husch) Provides near 250 sources on geometry. 5-00 Geometry Resources (ISLMC) 11-99 Geometry Resources (Math Forum) Math By Topic or Strand - Grades 10 - 12 (Math Central) Provides math resources by topic. Includes algebra, geometry, calculus, trigonometry, and more. 1-00 Math By Topic or Strand - Grades 6 - 9 (Math Central) Provides math resources by topic. Includes algebra, geometry, and more. 1-00 Math Sources (Phister) Gnarly Math provides sources of activities to stimulate the love of math, especially algebra and geometry. 9-99 Sources of Geometry Information (TEAMS) Provides dozens of sources of information in geometry. 3-01 Spheres (Polking) Provides explanations and diagrams related to spheres in geometry. 5-00 Materials Software for Geometry (Geometry Technologies - ScienceU.com) Provides software for geometry. 5-01 Papers Advanced Geometry Formulas and Facts Basic Definitions, Assumptions, and Theorems (Fidler) Provides some of the basic assumptions, definitions, and theorems of geometry. 6-02 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 Curves - Special Plane Curves (Xah Lee) Provides diagrams of special curves discussed in geometry. 5-00 Curves Index (University of St. Andrews, Scotland) Provides famous geometric curves. 4-00 Curves Index (Xah Lee) Provides a history, description, diagrams, properties, and formulas of many curves. Listed by alphabetically by name. 5-00 Definitions in Geometry (Bigchalk - Worldbook Online) Provides definitions and explanations of key terms in geometry. 5-01 Definitions of Geometry (Princeton - Mistry) Provides five definitions and explanations. 5-01 Euclid's Elements (Clark University - Joyce) Provides Euclid's Elements online. According to Joyce, Euclid's Elements help teach basic deductive reasoning. 4-00 Euclid's Elements (Clark University - Joyce) Provides Euclid's Elements online. According to Joyce, Euclid's Elements help teach basic deductive reasoning. 4-00 Four-Dimensional Objects (Geometry Center - Hansmann) Provides examples of two-dimensional objects trying to understand three-dimensions to explain a four-dimensional object, something that we cannot see. Includes diagrams. 5-00 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 Geometry Basics (Zobel) Teaches the basics of geometry using diagrams and examples. 4-00 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 Geometry Formulas for Surface Areas and Volumes (Manura) Provides simple drawings with the formulas. A basic reference for geometry. 1-00 Geometry Questions and Answers (Math Forum - Ask Dr. Math) Includes key questions asked by high school students about geometry problems. 7-99 Geometry Questions and Answers (Math Forum - Ask Dr. Math) Includes key questions asked by middle school students about geometry problems. 7-99 Glossary for Geometry (Lanius) Provides definitions of key words used in introductory level geometry. 8-02 History of Geometry (Lanius) Provides a short history and an assignment at the end. 8-02 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 Orbifolds (Conway) Provides equations for Unbounded Populations, Limits on Growth, Equilibria, Stability, and Phase Space Harvesting. 5-01 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 Postulates and Theorems - Basic (Thinkquest 2647) Provides 14 postulates and seven theorems. British. 5-00 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 Game - Kali Geometry Game Game - QuasiTiler Geometry Game Game - Teichmuller Space Navigator Geometry Game Geometry - The Sacred Cut (Princeton - Mistry) Describes proportions used by the ancient Romans. 5-01 Geometry Exercises (AAA Math - Banfill) Provides interactive practice by topic and includes volume, area, surface area, circumference and perimeter, polygons, and more. 12-00 Geometry Projects and Tools (Costantino and Ewing) Provides geometry tools, called Ptools, with an emphasis on Ptolemy. 5-00 Interactive On-Line Geometry Interactive Online Geometry Tetrahedral Puzzle (Geometry Technologies - ScienceU.com) "The object of this puzzle is to reconstruct a cube from ten tetrahedral pieces." 5-01 Two-Dimensional and Three-Dimensional Geometry (Levy) Provides exerpts from the CRC Standard Mathematical Tables and Formulas. 5-00 Standards Geometry Standards (North Carolina Public Schools) 2-00 Grade 07 Math Standards (McREL) Geometry 1-01 Grade 07 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 08 Math Standards (McREL) Geometry 1-01 Grade 08 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 09 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 10 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 11 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 12 Math Standards (NCTM) Includes Algebra, Trigonometry, Geometry, Estimation, Probability and Statistics, and more. 5-02 Grade 9 - 12 Math Standards (McREL) Geometry 1-01 Grade 9 - 12 Math Standards (Texas) Integrated Math 1 - Geometry, Algebra, and Probability Standards (North Carolina Public Schools) 2-00 Integrated Math 2 - Geometry, Algebra, and Probability Standards (North Carolina Public Schools) 2-00 Integrated Math 3 - Geometry, Algebra, and Probability Standards (North Carolina Public Schools) 2-00 Worksheets Geometry and Measurement (ProTeacher) Provides 10 sources of lessons. Many include worksheets. 12-99

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