This tool enables you to specify a circle by first placing its center point, and then clicking to indicate a point that lies on the curve.
As you drag the circumference, the Circular Arc tool displays the radius of the circle in current linear units.
Specifies the degree of the curve. The values range from 2 to 7. The default is 6.
Specifies the number of spans in the curve. The values range from 1 to 14. The default is 1.