Polygon Tool Options
The Sheet Metal sketch options allow you to choose between sketching a flat wall or a wall that is perpendicular to the sketch plane.
See Common Sketch Options for descriptions of the common sketch options.
The following additional options are available in the Options panel:
Use internal radius: Select this option to dimension the polygon based on the diameter of a circle inscribed within the polygon. Uncheck the option to dimension the polygon based on a circumscribed circle. In the image below, the blue circle is inscribed within the polygon and the orange circle is circumscribed around it.