This ho-hum crasher activity introduces right triangles to students. Each team of three works together to create 3D knowledge cubes about right triangles and the Pythagorean Theorem. Once the cubes are constructed, teams stack them so that four sides reflect a topic about right triangles (parts of the right triangle, Pythagorean's Theorem, right angle, etc.). It's a puzzle. It's a hands on activity. It's minds on, too. There is only one way that the cubes will stack to reveal the correct i