You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Menu+Structure
You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC20UG/Tools+Mapped+to+Menus
Arc_Start, Center, End
 Creates an arc by defining its start point, the center point, and the end point.Note: You can use the local menu options to create this arc differently. .
- Select the arc start point and then the center point. You can also specify the Radius and Angle in the Inspector Bar.
- Move the cursor counterclockwise to draw the arc, or enter the End Angle in the Inspector Bar.