This tool is used to create a CAD Arc, using the 3 directed tangents method.

The video below will show how to create a CAD Arc using the 3 directed tangents method.

Or continue down the page to see the CAD Arc 3 directed tangents create option.

This CAD Arc 3 Points option is found on the CAD Arc Toolbar, and is the 3rd option when the toolbar files out.

Or from the menu, Use: CAD => Arc => 3 Directed Tangents

CAD Control Bar Options

The Arc is created and placed using the details from the CAD Control Bar, these include,
String Name, Model, Colour, Z – Value, Linestyle, Weight and Tinable.

If you would like to learn more about the CAD Control Bar and how to utilise it,

Visit this post: CAD Control Bar – How to Utilise It

Pick and Accept on the first tangent of a string segment.

Note: Arc and Circles in 12d Model can be both clockwise and anti-clockwise in direction.
Clockwise arc/circles are entered into a panel with a positive (+) radius.
Anti-Clockwise arc/circles are entered into a panel with a negative (-) radius.
Please check the direction of the arc/circle to be created and use pick with direction if required.

If you would like to learn more about Picking with Direction and how to utilise it,
Visit this post: Picking with Direction

Pick and Accept the second tangent of a string segment.

Pick and Accept the third tangent of a string segment.

The new arc is created tangential to the 3 selected string segments and the radius is calculated from these string segments.

Use a String Inquire to check the details of the new arc.