Create a circle that passes through 3 points.
The CAD Circle, by 3 Points, tool is found on the CAD Circle Tooolbar, and is the 1st option.
Or from the menu, go to: CAD => Circle => 3 Points
On selecting the command, the user will be prompted (via the message box in the bottom-left corner of the 12d Model window) to select the First, Second, and Third points.
The Circle is created and placed using the details from the CAD Control Bar, these include the string Name, Model, Colour, Z-Value, Linestyle, and Weight.
If you would like to learn more about the CAD Control Bar,
Visit this post: CAD Control Bar.