Math Playground
Math Playground: Tangrams
Click on the tangram frame to start. Use the white tangram pieces to make the picture shown on the upper right.
University of Cambridge
University of Cambridge: Nrich: Game Tantaliser Tantrix Discoveries
This game combines tangrams and pattern recognition to offer you a challenge. The page has a "Printable page" link if you want to print it out to help you work with the problem.