Use the various dimensioning tools to measure 2D and 3D objects, and to add dimensioning lines and measurements to the drawing. Dimensions can be created on a design layer, or in the annotation space of a sheet layer viewport (see Creating annotations for sheet layer viewports).
There are also Tape Measure and Protractor tools to measure distances and angles, and a Center Mark tool to mark the center of circles, ovals, and rectangles.
When you add a new dimension, the dimension standard set in the document preferences is used by default (see Document preferences: Dimensions tab). When a dimension tool is active, you can also set the default dimension standard from the Tool bar. Select any of the built-in dimension standards, or create a custom standard. If you change the default dimension standard, new dimensions will use that standard, but no existing dimensions are affected.
The units and precision for all dimension measurements in a file are controlled by the document unit settings (see Units).
Dimensions are automatically placed in the Dimension class. Edit the class to set a default pen style, color, and thickness, as well as a text style for dimensions (see Setting class properties). Select the Use at Creation option to automatically apply the class settings when you create new dimensions.
Dimension markers are always controlled by the dimension standard; they cannot be changed from the Attributes palette or the Dimension class properties.
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