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On the Label or Dimension toolbar, select Axis
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Select an element to which you want the dimension axis to be parallel or perpendicular.
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Choose distance between, then place a dimension. You can now place a dimension that runs parallel or perpendicular to the dimension axis that you have defined.
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To use the dimension axis that you set using Axis, select Distance Between or Coordinate Dimension on the Label or Dimension toolbar.
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On the ribbon, set Explicit in the Dimension Axis box. After you define the dimension axis, you can place dimensions that run parallel to or perpendicular to the dimension axis.
