Perimeter Annotation
The Perimeter Measurement Annotation is used to calculate the length of all sides of a shape or a multi-segment line. Once placed measurements can be modified by dragging any of the vertices on the measurement and the values will be updated as well.
Creating a Perimeter Measurement
- Select the Perimeter tool by clicking the
in the Comment Tab on the toolbar or using the shortcut key Ctrl + Alt + R (⌘ + Alt + R on Mac) - The measurement dialog will be displayed where you can set the scale and precision (and calibrate if needed) for the measurement prior to drawing the annotation.
- Click where you would like the first line to begin
- Continue clicking on the document to create as many vertices as you need (Note: Hold the Shift key while drawing to make horizontal, vertical, or 45 degree angle lines.)
- When finished, double-click, press Enter on the keyboard, or right-click and select Complete from the menu to complete the measurement shape
Measurement Options
The following options can be set before the measurement is created.
Scale
Options to set the scale and precision (and calibrate if needed) for the measurement prior to drawing the annotation. By default the horizontal and vertical scale will be the same.
Check the "Separate Vertical Scale" option to specify a different vertical scale for the measurement.
Other
Snap to Content - each point of the measurement will automatically attempt to snap to the nearest content item when clicked
Display Measurements - show / hide the measurement label on the measurement line
Always used fixed angles (shift key) - forces all measurements to make horizontal, vertical, or 45 degree angle lines only
Annotation Properties
To access the Perimeter properties go to the Properties Tab on the toolbar or right click (Mac: Ctrl + Click) on the annotation and choose Properties in the mouse menu or click on the edit button 
on the Mini Toolbar. The Perimeter measurement contains the following property settings.
Appearance
Line Width - Sets the width of the line
Style - Sets the style for the line (i.e. dotted, dashed, cloud, etc...)
Color - Sets the color of the line
Transparency - Sets the transparency of the measurement
Note / Comment - Contains two fields. The first is a comment field that allows you to add an additional comment to the measurement if needed. The second is the measurement value and can not be edited.
Save as default - When checked this will make the selected appearance settings the default for any new Perimeter annotations going forward
Locked - When checked prevents the following on the annotation: being moved or resized, editing appearance properties, & deleting the annotation.
General
Author - Allows you to edit the author
Subject - Allows you to edit the subject
Layer - Only available when the document contains layers. Sets the layer that the annotation belongs to. For more information see Assigning Comments to Layers
Status History
This tab will display and changes to the review status of the annotation including Author, Status, and Timestamp. For more details see Setting Status or Check Marks on Annotations