To Create an Angular Dimension by Specifying Three Points (AutoCAD Mechanical Toolset)
Click Home tabDimension panelPower Dimension. Find
At the “Specify first extension line... prompt, press ENTER.
Specify the vertex of the angle (1).
Specify the angle end points (2 and 3).
Specify the dimension location (4).
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