To draw a line at an angle to a curve

1. Click the Line at Angle icon, or choose Lines > Line at Angle from the Keypoint Curve Toolbox.
   
2. Click the start point of the new line on the curve from which it will angle off.

   If you click a curved line, the new line is drawn at an angle to the line that passes through the end point of the curve.

   
3. If you want to project the line at an exact angle, type the value of the angle and press (Windows) or (Mac). The Line at Angle tool adds a new guideline at that angle.
   
4. Click the end point of the new line.

   As you drag the end point, the Line at Angle tool displays the angle in current angular units (degrees by default).

Tips and notes

• You can continue to change the offset distance (for parallel lines) or angle in the Information window. (See the Interface section of the Basic Tools book.)
• These special relationship attributes remain with the lines until you manually modify one of the lines.
• The relationship attribute for lines created with the Line at Angle tool is called Rel Angle (Relative angle). All lines have an attribute called Angle/Sweep, which is the angle to the horizontal axis of the orthographic window, as well as a Length attribute.

Line Angle Options

Degree

Specifies the degree of the curve. The values range from 1 to 7. The default is 1.