When you hover over an object for dimensioning, the DIM command automatically previews
a suitable dimension type to use. Select objects, lines, or points to dimension and
click anywhere in the drawing area to draw the dimension.

The supported dimension types range from vertical, horizontal, aligned, and rotated
linear dimensions, to angular dimensions, to radius, diameter, jogged radius, and
arc length dimensions, to baseline and continued dimensions. If required, you can
change the dimension type using command line options.

The following prompts are displayed.

Select objects

Automatically selects an applicable dimension type for the objects you select and
displays the prompts corresponding to that dimension type.

Selected object type	Action
Arc	Defaults the dimension type to radius dimensions.
Circle	Defaults the dimension type to radius dimensions.
Line	Defaults the dimension type to linear dimensions.
Dimension	Displays options to modify the selected dimension.
Ellipse	Defaults to options set for selecting a line.

First extension line origin

Creates a linear dimension when you select two points.

Angular

Creates an angular dimension showing the angle between three points by or the angle
between two lines (same as the DIMANGULAR command).

• Vertex. Specifies the point to use as the vertex of the angle.
• Specify first side of angle. Specifies one of the lines that form the angle.
• Specify second side of angle. Specifies the other line that forms the angle.
• Angular dimension location. Specifies where to place the dimension arc line. Depending on the position of the
  dimension, the quadrant for the dimension changes.
  • Mtext. Displays the Text Editor contextual tab, which you can use to edit the dimension
    text.
  • Text. Customizes the dimension text at the Command prompt. The generated dimension is displayed
    within angle brackets.
  • Text angle. Specifies the angle of the dimension text.
  • Undo. Returns to the previous prompt.
• Undo. Returns to the previous prompt.

Baseline

Creates a linear, angular, or ordinate dimension from the first extension line of
the previous or selected dimension (same as the DIMBASELINE command).

NOTE:By default, the last created dimension is used as the base dimension.

• First extension line origin. Specifies the first extension line of the base dimension as the extension line origin
  for the baseline dimension.
• Second extension line origin. Specifies the next edge or angle to dimension.
• Feature Location. Uses the endpoint of the base dimension (ordinate dimension) as the endpoint for
  the baseline dimension.
• Select. Prompts you select a linear, ordinate, or angular dimension to use as the base for
  the baseline dimension.
• Offset. Specifies the offset distance from which the baseline dimensions are created.
• Undo. Undoes the last baseline dimension created.

Continue

Creates a linear, angular, or ordinate dimension from the second extension line of
a selected dimension (same as the DIMCONTINUE command).

• First extension line origin. Specifies the first extension line of the base dimension as the extension line origin
  for the continued dimension.
• Second extension line origin. Specifies the next edge or angle to dimension.
• Feature location. Uses the endpoint of the base dimension (ordinate dimension) as the endpoint for
  the continued dimension.
• Select. Prompts you select a linear, ordinate, or angular dimension to use as the base for
  the continued dimension.
• Undo. Undoes the last baseline dimension created.

Ordinate

Creates an ordinate dimension (same as DIMORDINATE command).

• Feature location. Prompts for a point on a feature such as an endpoint, intersection, or center of
  an object.
  • Leader endpoint. Uses the difference between the feature location and the leader endpoint to determine
    whether it is an X or a Y ordinate dimension. If the difference in the Y ordinate is greater, the dimension measures the X ordinate. Otherwise, it measures the Y ordinate.
  • Xdatum. Measures the X ordinate and determines the orientation of the leader line and dimension
    text.
  • Ydatum. Measures the Y ordinate and determines the orientation of the leader line and dimension
    text.
  • Mtext. Displays the Text Editor contextual tab, which you can use to edit the dimension
    text.
  • Text. Customizes the dimension text at the Command prompt. The generated dimension is displayed
    within angle brackets.
  • Angle. Specifies the angle of the dimension text.
  • Undo. Returns to the previous prompt.
• Undo. Returns to the previous prompt.

Align

Aligns multiple parallel, concentric, or same datum dimensions to a selected base
dimension.

• Base dimension. Specifies a dimension to use as basis for the dimensions alignment.
  • Dimensions to align. Selects the dimensions to align to the selected base dimension.

Distribute

Specifies the method on how to distribute a group of selected isolated linear or ordinate
dimensions.

• Equal. Equally distributes all selected dimensions. This method requires a minimum of three
  dimension lines.
• Offset. Distributes all selected dimensions at a specified offset distance.

Layer

Assigns new dimensions to the specified layer, overriding the current layer. Enter
Use Current or ” . ” to use the current layer. (DIMLAYER system variable)

Undo

Reverses the last dimension operation.

The following options are displayed when you place a dimension in such a way that
it overlaps an existing dimension.

Move away

Arranges the existing dimension and the newly inserted dimension into a baseline dimension
type.

Break up

Splits up the existing dimension into two dimensions, and arranges those dimensions
into a continued dimension type.

Replace

Deletes the existing dimension and replaces it with the one you insert.

None

Inserts the new dimension on top of the existing dimension.