How to Draw Radial Lines

Question

Hi,
I need to draw radial lines emanating from an arc at fixed, known angles.   The lines will originate at the arc and radiate outward.  Imagine a kid's drawing of the sun:  a circle with little rays poking out of it - that's what I need to do.  I really don't want to do the trig to determine the endpoints of the lines.  Is there an easier way to to this?
Thanks!