S&W page 157, exercise 1.5.19 (modified):

Write a program that has a main variable N that plots N points equidistant around a circle and then draws a line between each of the N points and the other N-1 points. For N >8 this results in pretty star structures.

Hint: first calculate a "delta" value that is the space, in radians, between the points. Use this delta value to equally space the points.