Jan 9 // Geometry

Watch this

http://www.google.com/url?sa=t&rct=j&q=geometry+khan+trapezoid&source=web&cd=1&ved=0CBsQtwIwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DV4kNP_MhZ8s&ei=nx4LT63_Oo-DsgKGuqGRCg&usg=AFQjCNEerdU3riuuc_6Nt0iKh0Te61is3w