You can find any tool by the Menu Structure HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Menu+Structure
You can find the menu location of any tool by name HERE: https://turbocaddoc.atlassian.net/wiki/display/TC21UG/Tools+Mapped+to+Menus
Circle_Center, Radius
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Creates a circle by defining its center and a point on its circumference.
- Select the circle centerpoint. Move the cursor to size the circle.
- Click to create the circle, or enter the radius, diameter, or circumference in the Inspector Bar.
Local menu options:
 The local menu contains options to switch to any of the other circle tools.