On 7/12/2013 2:41 PM, Robert Hansen wrote: > > On Jul 12, 2013, at 1:04 PM, "Louis Talman" <email@example.com > <mailto:firstname.lastname@example.org>> wrote: > >> But I think the proof I animated at >> <http://rowdy.msudenver.edu/~talmanl/HTML/Pythagoras.html >> <http://rowdy.msudenver.edu/%7Etalmanl/HTML/Pythagoras.html>> is >> somewhat more nearly visual. > > I think this is an excellent example of a visual proof. > > Bob Hansen I very vaguely recall a visual proof of PT found on the 2 faces of a Roman coin. It was in a /Mathematics Teacher /from the 60s or 70s. Does anyone know what the 2 faces were?