Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2wD/ Esercizi: http://www.khanacademy.org/exercise/herons_formula Traduzione in Italiano del video Heron's Formula http://www.youtube.com/watch?feature=player_embedded&v=-YI6UC4qVEY http://www.khanacademy.org/video/heron-s-formula?playlist=Geometry Help us caption & translate this video! http://amara.org/v/B2wD/