Area di un Triangolo Equilatero Inscritto (uso di trigonometria di base)

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2vT/ Traduzione in Italiano del video Area of Inscribed Equilateral Triangle (some basic trig used) http://www.youtube.com/watch?feature=player_embedded&v=UmiZK6Hgm6c http://www.khanacademy.org/video/area-of-inscribed-equilateral-triangle--some-basic-trig-used?playlist=Geometry