To draw an arc tangent to a curve

1. Click the Arcs > Arc Tangent to Curve icon, or choose Arcs > Arc Tangent to Curve from the Keypoint Curve Toolbox.
   
2. Click the start point of the new arc on the curve it will be tangent to.
   
3. Click the end point of the arc, or type a 3D coordinate to place the point exactly.
   • Click the button to add the point freely.
   • Click the to align the point horizontally to the first point.
   • Click the to align the point vertically to the first point.

   As you drag the end point, the Arc Tangent to Curve tool displays the radius of the arc in current linear units.

Arc Tangent To Curve Options

Degree

Specifies the degree of the curve. The values range from 2 to 7. The default is 6.

Spans

Specifies the number of spans in the curve. The values range from 1 to 14. The default is 1.

Note

The sum of the degree and number of spans cannot exceed 16. When creating rational geometry, as set in Preferences > Construction Options , the Spans option is not available.