Math Viva Voce

Please click here for my Math Vivo Voce project.
If the link does not work, please copy this into your url bar : 
http://www.youtube.com/watch?v=RgLpnr0eLvs&feature=player_embedded



Part B: From this project, I find that I have made an improvement from last time, due to gain of experience like the way I present the solution in the video. But I think my weakness is that I did not articulate my words properly.