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Curve Polygon > <Options> 
The Polygon command draws a closed polyline with a specified number of sides.
Commandline options  

NumSides 
Specifies the number of sides for the polygon. 
Vertical 
Draws a polygon perpendicular to the construction plane. 
AroundCurve 
Draws a polygon perpendicular to a curve. 
Mode 
InscribedDraws the polygon where the corners of the sides touch an imaginary circle of a specified radius. Inscribed steps
CircumscribedDraws the polygon where the midpoints of the sides touch an imaginary circle of a specified radius. Circumscribed steps

Draws a polygon by defining one edge. Edge steps
FlipFlips the polygon about the edge you are drawing. 

Draws a starshaped polygon. Star steps
AutomaticIf the polygon has 5 or more sides, the Automatic option creates a star where the size of the outer and inner points are equal. 
Rhinoceros 6 © 20102019 Robert McNeel & Associates. 21Aug2019