Fletch.
The problem is easily enough solved but what are you working with? what machines are you working with?
A simple divider / compass could be used to scribe a circle from center of the piece and the same tool could be used to mark off at 120DEG each, the angle of 45deg could come from the plane of the surface holding the legs.... the question is simple but the correct answers will come from what your working with.
Anthony......