You can show rulers in the workspace to help you align and place objects in a drawing.
Go to the View menu and choose Show Rulers.
You will see rulers along the top and left sides of the workspace.
Rulers display the unit of measure used by the canvas. If you want to change the rulers to show a different unit of measure, click the Canvas button on the toolbar.
On the editing panel, use the Dimensions pull-down menu to choose a different unit of measure.
The ruler will change to reflect the new setting.