Create Radial Dimensions - Autodesk 057B1-41A111-1001 - AutoCAD LT 2010 User Manual

Extension lines are created perpendicular to the dimension line. However, if
the extension lines conflict with other objects in a drawing, you can change
their angle after the dimension has been drawn.
New dimensions are not affected when you make an existing dimension
oblique.

Create Radial Dimensions

Radial dimensions measure the radii and diameters of arcs and circles with
optional centerlines or a center mark.
There are two types of radial dimensions:
DIMRADIUS measures the radius of an arc or circle, and displays the
dimension text with the letter R in front of it.
DIMDIAMETER measures the diameter of an arc or circle, and displays the
dimension text with the diameter symbol in front of it.
402 | Chapter 9 Annotate Drawings