Autodesk AUTOCAD 2006 Command Reference Manual page 935

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radius
Specifying the radius with your pointing device determines the rotation
and size of the polygon. Specifying the radius with a value draws the bottom
edge of the polygon at the current snap rotation angle.
Circumscribed about Circle
Specifies the distance from the center of the polygon to the midpoints of
the edges of the polygon.
Specify radius of circle: Specify a distance
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radius
Specifying the radius with your pointing device determines the rotation
and size of the polygon. Specifying the radius with a value draws the bottom
edge of the polygon at the current snap rotation angle.
Edge
Defines a polygon by specifying the endpoints of the first edge.
Specify first endpoint of edge: Specify a point (1)
Specify second endpoint of edge: Specify a point (2)
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Advanced Settings for COM Port Dialog Box | 911