AMPOWERDIM_DIA command
Creates a diameter dimension.

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Description
Creates diameter dimensions for arcs and circles. The command is a shortcut to the Radial Diameter option of the PDIM command. It automatically adds a diameter symbol to the dimension text.
Methods
Select the arc or the circle and the location of the dimension line.
The Edit Dimensioning dialog box opens to define the parameters of the dimension.
After the aligned linear dimension is created, you can define new dimensions by choosing PDIM command options.