TITLE: Looking for a Drawing Program
QUESTION [6 upvotes]: I am writing a math exam and I'd like to include a picture.  I want a free drawing program so that I can draw the coordinate axes with a unit circle.  Inscribed in the unit circle will be a hexagon.  The interior of the hexagon will be divided into triangles.  Which drawing program will make this process as painless as possible?

REPLY [3 votes]: Since you mention nowhere that your program has to include a GUI, TikZ is always mentionable (although I know that if this is just a quick assignment for an exam, even using LaTeX might seem like overkill).
You can look at the official documentation here: paws.wcu.edu/tsfoguel/tikzpgfmanual.pdf
and some different examples here: http://www.texample.net/tikz/examples/