This site will keep even puzzle enthusiasts busy with a very wide variety of puzzles to choose from. Stop by the Puzzle Playground for printable puzzles and the Puzzle Club for online interactive puzzles. Besides puzzles there are optical illusions, puzzle articles, and tricks to choose from. If you are up for even more puzzle challenges, check out the links in the Puzzle Up section. Here are a series of interactive geometry diagrams that can be used as platforms for geometry investigations to uncover underlying geometric principles and relationships.
Students thereby become active participants in the world of geometry which is now approachable.
The result is that students readily learn geometric reasoning and begin to think in geometric terms. Then check out the USA Mathematical Talent Search program which has just finished its 12th year. There are problem sets and solutions from previous sessions so your students can work up to next year's competition. This Talent Search is also a gateway towards entrance to the American Invitational Mathematics Examination. If so here is the site for you.