Tool Palettes Curves > Lines (Tangent) > Line tangent to curve > To draw a line tangent to a curve

Curves > Lines (Tangent) > Line tangent to curve

Allows you to draw a keypoint line tangent to an existing curve.

To draw a line tangent to a curve

Click the Curves > Lines (Tangent) > Line tangent to curve icon, or choose Lines (Tangent) > Line tangent to curve from the Curves palette menu.
Click the start point of the tangent line.
Click the curve you want the line to be tangent to.

The Line tangent to curve tool calculates the end point for the line to be tangent to that curve.

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.