In AutoCAD 2012, we will find the dimensional constraints located in the center of the Parametrics tab on the ribbon. We can also use the DIMCONSTRAINT command.
Here we will find the standard types of dimensions, but these dimensions are able to drive our geometry, if we can dimension a circle with the Radial option and later control that circle by simply changing the dimension value. We will want to use Dimensional Constraints on geometry you want to be able to easily change or on geometry you want to constrain to a specific size.
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