To Create a Radius or Diameter Dimension (AutoCAD Mechanical Toolset)

1. Click Home tabDimension panelPower Dimension. Find
2. Press ENTER.
3. In the drawing area, select an arc or a circle (1).
4. Place the dimension line (2).
5. 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.
6. Click Power Dimensioning tabClose panel Close Editor. Find
7. Press ENTER to end dimensioning.