PRACTICAL 3: STEREOGRAPHIC PROJECTION AND THE STEREONET.
At completion of this practical we will be able to plot on a stereonet planar and linear elements and to determine their angular relationship.
Stereographic Projection Great Circles Small circles: Part A Small Circles: Part B.
Plotting planes Plotting lines Pitch and angles Click here to go to the exercise page.

More explanation? The ultimate stereonet tool ...
http://www.visible-geology.appspot.com/stereonet.html