Quick
Dimension (2D) 
Insert 
Dimension (Sketch/Sheet Level)
Use this command to create a dimension by
selecting an entity or picking dimension points. Six different dimension
types can be created with this command depending on the entities, points,
and command options selected (see below). Tangent arcs/circles are dimensioned
with the 2 Point method. Smart Pick is automatically invoked during this command.
Select the first point or arc/circle tangent to dimension from.
Select the second point or arc/circle tangent to dimension to.
Drag to select the dimension type (horizontal, vertical, aligned, or tangent) and to locate the dimension text.
Dimensioning Points with Quick Dimension
If one of the dimension points is a tangent
arc/circle then a point is created on the arc/circle and two constraints
are placed on the point. One to constrain the point on the arc/circle
Constrain Points to
Curve
and one to constrain the point relative to the
baseline Constrain Point
to Line - Base Point Option 
.
Select the line to dimension from.
Drag to select the dimension
type (e.g., horizontal, vertical, or aligned) and to locate the dimension
text.
Using Quick Dimension
Dimensioning Lines with Quick Dimension
Select the first parallel line to dimension from.
Selected select the second parallel line to dimension to.
Drag to locate the dimension text.
Dimensioning a fillet:
Select the fillet to dimension.
Drag to locate the dimension
text.
Dimensioning a circle:
Pick the Rad/Dia option and set the mode to Radius.
Select the circle to dimension.
Drag to locate the dimension
text.
Dimensioning a curve:
Pick the Rad/Dia command option and set the mode to Smart.
Select the curve on the segment you wish to dimension.
Drag to locate the dimension text.
Dimensioning a circle:
Pick the Rad/Dia command option and set the mode to Diameter.
Select the circle to dimension.
Drag to locate the dimension
text.
Dimensioning a fillet:
Pick the Rad/Dia command option and set the mode to Radius.
Select the fillet to dimension.
Drag to locate the dimension
text.
Angle dimension between 2 lines:
Select the first line near the end to dimension.
Select the second line near the end to dimension.
Drag to locate the dimension
text.
Horizontal or vertical angle dimension:
Right-click and select Angular Dim. from the Input Options Menu.
Select the line to dimension.
Drag to select the dimension type (horizontal or vertical) and to locate the dimension text.
From - Select the first point to dimension.
To - Select the second point to dimension.
Origin - Specify the dimension text origin.
Dimension Mode
Automatic
Horizontal
Vertical
Aligned
Placement
Select the icon to either center or not center the dimension text between the extension lines. If not center is selected, the dimension location point will also dynamically locate the text.
Text
Use this option to determine how the text of the dimension is generated. Select from the following:
Value - The dimension text will default to the actual dimension value.
User Text - The dimension text defined in the User Text field (see below) is displayed instead of the dimension value.
User text
Defines the dimension text that is displayed instead of the actual dimension value. Used in conjunction with the User Text option above. Enter the user text in the field provided. You can also right-click in the graphics window to activate the Text and Dimension Editor. It provides additional options for creating special characters and symbols within the text.
Dimensioning to External Reference Points (see CAD Tips & Techniques).
