Creating 2D Drawings from 3D Data - Inventor 2013 and Inventor LT 2013 Essentials - page 53

FIGURE 2.22 Adding a radial
dimension
FIGURE 2.23 Even angular dimensions
can be placed with the General Dimension tool.
FIGURE 2.24 The geometry selected
determines the type of dimension placed.
As you see, the General Dimension tool is incredibly flexible.