To Create a Rotated Dimension (AutoCAD Mechanical Toolset)
Click Home tabDimension panelPower Dimension. Find
Specify the first (1) and second (2) extension line origin.
When prompted for the dimension line location, enter R.
Enter an angle for the dimension line.
Place the dimension line (3).
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