Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2wH/ Esercizi: http://www.khanacademy.org/exercise/equation_of_an_ellipse Traduzione in Italiano del video Conic Sections: Intro to Ellipses http://www.youtube.com/watch?v=lvAYFUIEpFI http://www.khanacademy.org/video/conic-sections--intro-to-ellipses?playlist=Algebra Help us caption & translate this video! http://amara.org/v/B2wH/