To Create a Dimension That Shows the Angle Two Points on a Circle Subtend on Its Center (AutoCAD Mechanical Toolset)
Click Home tabDimension panelPower Dimension. Find
Select the points on the circle that define the angle (1 and 2).
Specify the dimension location (2).
Edit the dimension as required, using the settings on the Power Dimensioning ribbon contextual tab, or click Power Dimensioning tabPredefined drop-down ( Find) and select a predefined dimension text template.
Click Power Dimensioning tabClose panel Close Editor. Find