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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 Basic Shapes (Educator's Reference Desk) Provides five lesson plans, most related to basic shapes. 1-04 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 Circles in Geometry (TeachNet) Provides a single lesson. 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 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 Lessons (Information Institute of Syracuse) Provides lessons by topic and grade level. 1-04 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 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 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. Grade and Standards-Based Lessons (Illuminations - NCTM) Provides dozens of NCTM math standards-based lessons by topic. 01-07 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. 12-99 Lists Analytic Geometry (Merlot.org) Provides 32 sites that were peer rated four stars (out of five) in analytic geometry. 8-04 Differential Geometry Resources (Fife and Husch) Provides over two dozen sources on differential geometry. 5-00 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 (Math Forum) Geometry and Topology (Merlot.org) Provides 66 sites that were highly rated by peers. 8-04 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 Euclid (Gurupedia.com) "Euclid of Alexandria (Greek: Eukleides) (circa 365-275 BC) was a Greek mathematician who lived in the 3rd century BC in Alexandria. His most famous work is the Elements, a book in which he deduces the properties of geometrical objects and integers from a set of axioms, thereby anticipating the axiomatic method of modern mathematics. Although many of the results in the Elements originated with earlier mathematicians, one of Euclid's major accomplishments was to present them in a single logically coherent framework. The geometry of Euclid was known for many centuries as 'the' geometry, but is nowadays referred to as Euclidean geometry." 8-05 Euclid's Elements (Clark University - Joyce) Provides Euclid's Elements online. According to Joyce, Euclid's Elements help teach basic deductive reasoning. 4-00 Euclidian Geometry (Gurupedia.com) "In mathematics, Euclidean geometry is the familiar kind of geometry on the plane or in three dimensions." 8-05 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 Introduction to Geometry and Glossary (Gurupedia.com) "Geometry is the branch of mathematics dealing with spatial relationships. From experience, or possibly intuitively, people characterize space by certain fundamental qualities, which are termed axioms in geometry. Such axioms are insusceptible of proof, but can be used in conjunction with mathematical definitions for points, straight lines, curves, surfaces, and solids to draw logical conclusions." "Because of its immediate practical applications, geometry was one of the first branches of mathematics to be developed." Provides definitions of key words. 8-05 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 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 Tetrahedral Puzzle (Geometry Technologies - ScienceU.com) "The object of this puzzle is to reconstruct a cube from ten tetrahedral pieces." 5-01 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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