Building the Foundation of the Design - Autodesk Inventor 2010: No Experience Required - page 68

13. Place the angular dimension inside the perimeter of the sketch, as
shown in Figure 2.15.
FIGURE 2.15 Adding an angular dimension to the sketch
14. With the Dimension tool still active, click the numerical value of the
fi rst dimension to edit its value. See Figure 2.16.
FIGURE 2.16 Modifying the value of the dimension will change the sketch.