JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Dimension Diameter with the Dimension Placed Parallel Select the Dimension Radial tool ( Drawing > Annotate > Dimensioning ) . The Radial Dimensioning tool setting window opens. Select the circular element to be dimensioned. Set the mode to Dimension Diameter Parallel. Enter a data point to define the location and orientation of the dimension. Placing the dimension parallel to a circular element Parent topic: Radial Dimensioning