writing gcode with variables to cut angles

is it possible to cut angles through variables in gcode?
in the linux gcode overview it talks about polar coordinates. is that what to use?
eg. 

You can do it with a bit of trigonometry.
For example to make a 10inch move at a 30deg angle to the X-axis use the following line of g-codeIf that isn't what you had in mind, perhaps you could use G10L2Rn (n=angle of rotation) to rotate the X,Y axis about the Z. (But I've never used it so am abit unsure of all of the ramifications of using it.)

thanks I'll give it a shot

Oops I made some mistakes. I think that the expressions above may need a multiplication symbol between the travel distance and the sin/cos terms and needed brackets around the angles.
So should have been this.

Incremental polar coordinate moves still move about the origin, but step incrementally outward from the origin. This is a good way to approximate/make a spiral, but I'm not sure it is what the original poster was after.