This option generates tangent segments to the selected curve that cross the introduced point. Only one curve must be selected.

If the introduced point is on the curve, only one tangent segment is generated; otherwise, more than one segment may be inserted.

After confirming the point to across with the tangent line, the length of the segment is required. Positive or negative lengths determine the orientation of the resulting segments.

Figure 1. Example of tangent lines from a circle.