I'm working on a book of Pythagorean theorem proofs to do on The Geometer's Sketchpad. Awhile back someone posted a nice dissection using tangram-like pieces. It starts with isosceles right triangles on the legs and goes from there. I've got the proof in my notes, but I seem to have failed to note who posted it. Anyone want to claim it so I can give you credit in the book? Thanks.
Dan Bennett Key Curriculum Press firstname.lastname@example.org