N-GON (polygon) allows you to create a polyline polygon by
specifying the desired number of sides, rotation angle,
radius, radius type (flat or corner), and center position.

Enter the desired number of sides for the polyline and 
press <Enter>, or accept the default in parentheses by
pressing <Enter>.

Enter the rotation angle (in degrees) on which the 
polyline polygon is aligned. A positive angle value 
rotates the polygon about its center in a counter-
clockwise direction. Enter a positive radius value and
press <Enter>.

Indicate the radius by choosing from the following 
options:

CORNER - to indicate that the radius is measured from a
         vertex (corner) of the polygon.

FLAT   - to indicate that the radius is inscribed within 
         the polygon (flat).
