Click Application menu Drawing UtilitiesUnits. Find
As you change unit settings, you can see the Sample Output change:
Under Length, select a unit type and level of precision for linear drawing units.
Under Insertion Scale, select the unit that you want used to scale blocks, images, or other content inserted into the drawing.
Under Angle, select an angle type, precision, and direction for positive rotation for angular drawing units. Click Direction to set the reference direction for angles.