You know everyone needs help with their homework sometimes, and geometry is no exception. I know in school that was not always my favorite subject. So now a days having the internet is pretty handy. There is one site I can suggest for a geometric tolerance symbol. Just go to http://en.wikipedia.org/wiki/Geometric_dimensioning_and_tolerancing. They have all the history on it as well as the
. symbols. So get your books open and lets learn!