Geometry

  1. Coordinates and similar and congruent figures
    Definitions and explanations from the Math League.
  2. Erich’s Packing Center
    Erich enjoys packing geometric shapes into other geometric shapes: triangles in squares, circles in triangles, squares in circles, and more, with illustrations, equations, and indications of packings that have been proved optimal.
  3. Euclid’s Elements
    The reason for this site is to rekindle an interest in the Elements, and to show how Java applets can be used to illustrate geometry.
  4. Four Types of Symmetry in the Plane
    This Math Forum site offers brief explanations of rotation, translation, reflection, and glide reflection.
  5. Geometry Center
    The gallery of Interactive Geometry will open your eyes to such things as Projective Conics, Penrose tilings, Hyperbolic planes, Orbifold pinball, and much more. Keywords Hyperbolic plane, Lattice, Nonperiodic tilings, Numerical integration, Orbifold Pinball, Pascal`s theorem, Penrose tilings, Projective conics, Rainbows, Tilings All the formulas you've ever wanted. There are also plenty of great teacher resources, pictures describing geometrical functions, and computer programs for geometry.
  6. Geometry in Action
    Here are areas in which ideas from discrete and computational geometry - mainly low-dimensional Euclidean geometry - meet some real world applications. There are brief descriptions of those applications and the geometric questions arising from them, as well as pointers to Web pages and other sources of further information.
  7. Geometry Junkyard
    Links to various geometric sites.
  8. Hollister "Hop" David's Escher-like tiles
  9. Hollister "Hop" David's geometric art work  
    This site is amazing!  The images of how certain numbers, and trig. proofs are shown, as well as links to a ton of other neat stuff.  
  10. Mathematics and Molecules
    MathMol provides students, teachers, researchers and the general public with information about the rapidly growing fields of molecular modeling and related areas. It provide K-13 students and teachers with basic concepts in mathematics and their connection to molecular modeling. Keywords Chemistry, Geometry, Molecular modeling, Molecules, Water molecules
  11. Mathematical Art of M.C. Escher
  12. Math Forum - Geometry Problem of the Week
  13. M.C. Escher: Artist or Mathematician?
  14. M.C. Escher: Centennial Celebration Page
    This site contains an Escher biography, exhibits, books, and school resources.
  15. M.C. Escher: The Poet of the Impossible
  16. Motions in the plane
  17. Native American Geometry
    Explore an elegant proportional geometry based on the circle, and used by Native Americans for over 2000 years
  18. Polyhedra in the Classroom
  19. Rigid Motions in the Plane
  20. Shape and Space in Geometry
    Geometry and spatial sense, with background on why this is important and how it is addressed in the standards. Interactive web activities are included for both space and shape.
  21. Soma Cube Page: Seven 3 dimensional pieces which can be put together to form a cube.
    It is considered "one of the simplest and most elegant of all three-dimensional put-together puzzles."
  22. Symmetry and Pattern: The Art Of Oriental Carpets
  23. Symmetry and the Shape of Space
    A very simple site that teaches the mathematics of symmetry, step by step.
  24. Symmetry and Tessellations: Math Library
  25. Tessellations
    This site spotlights the work of the artist Robert Gathauer but also has lessons on tessellations.
  26. Tessellation Homepage
  27. Tessellation Resources
  28. Tessellation Tutorials and templates for making your own tessellations produce crystal and molecular models, parametric surfaces and several forms of sphere tessellations.
  29. Totally tessellated
    This site offers information on the history of tessellations, M.C. Escher, and mosaics and tiling.
  30. Tour of Symmetry Groups
  31. Virtual Polyhedra
    Want to learn what an icosahedron is? Or the 53rd stellation of the icosahedron? Explore the complex and beautiful world of many-sided geometric figures
  32. Wallpaper Groups (Plane Symmetry Groups)
    This site offers interesting examples of transformations in a plane.
  33. World of Escher
    Although the site's main purpose is the sale of Escher products, it provides background information on the artists works.