RPOLY, NSIDES, LSIDE, MAJRAD, MINRAD
Creates a regular polygonal area centered about the working plane
origin. 
NSIDESNumber of sides in the regular polygon. Must be greater than 2.
LSIDELength of each side of the regular polygon.
MAJRADRadius of the major (or circumscribed) circle of the polygon.
 Not used if LSIDE is input.
MINRADRadius of the minor (or inscribed) circle of the polygon.
 Not used if LSIDE or MAJRAD is
input.