To draw a tangent line between two curves

1. Click the Line Tangent from/to Curve icon, or choose Line Tangent & Perp > Line Tangent from/to Curve from the Keypoint Curve Toolbox.
2. Click the first curve the tangent line will touch.
3. Click the second curve the tangent line will touch.

   The Line Tangent from/to Curve tool calculates the line tangent to both curves.

   • If it cannot find a tangent, it prints a message in the prompt line.
   • If it finds more than one tangent, it uses the tangent closest to where you clicked.